SELINA Solutions for Class 10 Maths Chapter 16 - Loci (Locus and its Constructions)
Get complete access to Selina Solutions for ICSE Class 10 Mathematics Chapter 16 Loci (Locus and its Constructions) at TopperLearning. Refer to answers by experts to study the proofs given for proving that a point is equidistant from the given sides of a triangle. Practise problems based on the Angle-Angle-Side criterion of congruence.
In the Selina solutions, you will find the complete steps to draw the locus of points inside a triangle according to the question. Revise the solutions multiple times to grasp the proofs and construction methods elaborated by TopperLearning experts in the ICSE Class 10 Maths textbook solutions.
Chapter 16 - Loci (Locus and its Constructions) Exercise Ex. 16(A)
Given: PQ is a perpendicular bisector of side AB of the triangle ABC.
Prove: Q is equidistant from A and B.
Construction: Join AQ
Proof: In and
,
AP = BP (given)
(Each = 90
)
PQ = PQ (Common)
Hence Q is equidistant from A and B.
Given: CP is the bisector of angle
C of
Prove: P is equidistant from AC and BC.
Construction: From P, draw and
Proof: In and
,
Hence, P is equidistant from AC and AB
Given: AX bisects angle BAC and PQ is perpendicular bisector of AC which meets AX at point Y.
Prove:
i) X is equidistant from AB and AC.
ii) Y is equidistant from A and C
Construction: From X,
draw and
. Also join YC.
Proof:
i) In and
,
Hence, X is equidistant from AB and AC.
ii) In and
,
Hence, Y is equidistant from A and C.
Construct a triangle ABC, in which AB = 4.2 cm, BC = 6.3 cm and AC = 5 cm. Draw perpendicular bisector of BC which meets AC at point D. Prove that D is equidistant from B and C.
Given: In triangle ABC, AB = 4.2 cm, BC = 6.3 cm and AC = 5 cm
Steps of Construction:
i) Draw a line segment BC = 6.3 cm
ii) With centre B and radius 4.2 cm, draw an arc.
iii) With centre C and radius 5 cm, draw another arc which intersects the first arc at A.
iv) Join AB and AC.
is the required triangle.
v) Again with centre B and C and
radius greater than , draw arcs
which intersects each other at L and M.
vi) Join LM intersecting AC at D and BC at E.
vii) Join DB.
Proof: In and
Hence, D is equidistant from B and C.
In each of the given figures: PA = PB and QA = QB
i)
ii)
Prove in each case, that PQ (produced, if required) is perpendicular bisector of AB.
Hence, state the locus of the points equidistant from two given fixed points.
Construction: Join PQ which meets AB in D.
Proof: P is equidistant from A and B.
P lies on the perpendicular
bisector of AB.
Similarly, Q is equidistant from A and B.
Q lies on perpendicular bisector
of AB.
P and Q both lie on the
perpendicular bisector of AB.
PQ is perpendicular bisector of
AB.
Hence, locus of the points which are equidistant from two fixed points, is a perpendicular bisector of the line joining the fixed points.
Construct a right angled triangle PQR, in which , hypotenuse PR = 8 cm and QR = 4.5 cm. Draw bisector of angle PQR and let it meet PR at point T. Prove that T is equidistant from PQ and QR.
Steps of Construction:
i) Draw a line segment QR = 4.5 cm
ii) At Q, draw a ray QX making an angle of
iii) With centre R and radius 8 cm, draw an arc which intersects QX at P.
iv) Join RP.
is the required triangle.
v) Draw the bisector of which meets PR in T.
vi) From T, draw perpendicular PL and PM respectively on PQ and QR.
Proof: In and
Hence, T is equidistant from PQ and QR.
Construct a triangle ABC in which angle , AB = 5cm and BC = 6.4 cm. Draw perpendicular bisector of side BC and also the bisector of angle ACB. If these bisectors intersect each other at point P; prove that P is equidistant from B and C; and also from AC and BC.
Steps of Construction:
i) Draw a line segment BC = 6.4 cm
ii) At B, draw a ray BX making an angle of with BC and cut off BA = 5 cm.
iii) Join AC.
is the required triangle.
iv) Draw the perpendicular bisector of BC.
v) Draw the angle bisector of angle ACB which intersects the perpendicular bisector of BC at P.
vi) Join PB and draw .
Proof: In and
Hence, P is equidistant from B and C.
Again in and
Hence, P is equidistant from AC and BC.
In parallelogram ABCD, side AB is greater than side BC and P is a point in AC such that PB bisects angle B. Prove that P is equidistant from AB and BC.
Construction: From P, draw and
Proof: In and
Hence, P is equidistant from AB and BC.
In triangle LMN, bisectors of interior angles at L and N intersect each other at point A.
Prove that -
i) point A is equidistant from all the three sides of the triangle.
ii) AM bisects angle LMN.
Construction: Join AM
Proof:
A lies on bisector of
A is equidistant from MN and LN.
Again, A lies on bisector of
A is equidistant from LN and
LM.
Hence, A is equidistant from all sides of the triangle LMN.
A lies on the bisector of
Use ruler and compasses only for this question.
(i)Construct , where AB = 3.5 cm, BC = 6 cm and
(ii)Construct the locus of points inside the triangle which are equidistant from BA and BC.
(iii)Construct the locus of points inside the triangle which are equidistant from B and C.
(iv)Mark the point P which is equidistant from AB, BC and also equidistant from B and C. Measure and record the length of PB.
Steps of construction:
(i)Draw line BC = 6 cm and an angle CBX = 60o. Cut off AB = 3.5. Join AC, triangle ABC is the required triangle.
(ii)Draw perpendicular bisector of BC and bisector of angle B
(iii)Bisector of angle B meets bisector of BC at P.
BP is the required length, where, PB = 3.5 cm
(iv)P is the point which is equidistant from BA and BC, also equidistant from B and C.
PB=3.6 cm
The given figure shows a triangle ABC in which AD bisects angle BAC. EG is perpendicular bisector of side AB which intersects AD at point F.
Prove that:
i) F is equidistant from A and B.
ii) F is equidistant from AB and AC.
i)
Construction: Join FB and FC
Proof: In and
Hence, F is equidistant from A and B.
ii)
Construction: Draw
Proof: In and
Hence, F is equidistant from AB and AC.
The bisectors of B and
C of a quadrilateral ABCD intersect each other at point P. Show that P is equidistant from the opposite sides AB and CD.
Since P lies on the bisector of angle B,
therefore, P is equidistant from AB and BC .... (1)
Similarly, P lies on the bisector of angle C,
therefore, P is equidistant from BC and CD .... (2)
From (1) and (2),
Hence, P is equidistant from AB and CD.
Draw a line AB = 6 cm. Draw the locus of all the points which are equidistant from A and B.
Steps of construction:
(i) Draw a line segment AB of 6 cm.
(ii) Draw perpendicular bisector LM of AB. LM is the required locus.
(iii) Take any point on LM say P.
(iv) Join PA and PB.
Since, P lies on the right bisector of line AB.
Therefore, P is equidistant from A and B.
i.e. PA = PB
Hence, Perpendicular bisector of AB is the locus of all points which are equidistant from A and B.
Draw an angle . Draw the locus of
all points equidistant from AB and BC.
Steps of Construction:
i) Draw a ray BC.
ii) Construct a ray RA making an
angle of with BC. Therefore,
.
iii) Draw the angle bisector BP of
.
BP is the required locus.
iv) Take any point D on BP.
v) From D, draw and
Since D lies on the angle bisector
BP of
D is equidistant from AB and BC.
Hence, DE = DF
Similarly, any point on BP is equidistant from AB and BC.
Therefore, BP is the locus of all points which are equidistant from AB and BC.
Draw an angle , having AB = 4.6 cm
and BC = 5 cm. Find a point P equidistant from AB and BC; and also
equidistant from A and B.
Steps of Construction:
i) Draw a line segment BC = 5 cm
ii) At B, draw a ray BX making an
angle of and cut off BA = 4.6
cm.
iii) Draw the angle bisector of .
iv) Draw the perpendicular bisector of AB which intersects the angle bisector at P.
P is the required point which is equidistant from AB and BC, as well as from A and B.
In the figure given below, find a point P on CD equidistant from points A and B.
Steps of Construction:
i) AB and CD are the two lines given.
ii) Draw a perpendicular bisector of line AB which intersects CD in P.
P is the required point which is equidistant from A and B.
Since P lies on perpendicular bisector of AB; PA = PB.
In the given triangle ABC, find a point P equidistant from AB and AC; and also equidistant from B and C.
Steps of Construction:
i) In the given triangle, draw the
angle bisector of .
ii) Draw the perpendicular bisector of BC which intersects the angle bisector at P.
P is the required point which is equidistant from AB and AC as well as from B and C.
Since P lies on angle bisector of ,
It is equidistant from AB and AC.
Again, P lies on perpendicular bisector of BC,
Therefore, it is equidistant from B and C.
Construct a triangle ABC, with AB
= 7 cm, BC = 8 cm and .
Locate by construction the point P such that:
i) P is equidistant from B and C.
ii) P is equidistant from AB and BC.
Measure and record the length of PB.
Steps of Construction:
1) Draw a line segment AB = 7 cm.
2) Draw angle with the help of
compass.
3)Cut off BC = 8 cm.
4)Join A and C.
5)The triangle ABC so formed is the required triangle.
i) Draw the perpendicular bisector of BC. The point situated on this line will be equidistant from B and C.
ii) Draw the angle bisector of . Any point situated on this
angular bisector is equidistant from lines AB and BC.
The
point which fulfills the condition required in (i) and (ii) is the
intersection point of bisector of line BC and angular bisector of .
P is the required point which is equidistant from AB and AC as well as from B and C.
On measuring the length of line segment PB, it is equal to 4.5 cm.
On a graph paper, draw lines x = 3 and y = -5. Now, on the same graph paper, draw the locus of the point which is equidistant from the given lines.
On the graph, draw axis XOX’ and YOY’
Draw a line l, x = 3 which is parallel to y-axis
And draw another line m, y = -5, which is parallel to x-axis
These two lines intersect each other at P.
Now draw the angle bisector p of angle P.
Since p is the angle bisector of P, any point on P is equidistant from l and m.
Therefore, this line p is equidistant from l and m.
On a graph paper, draw the line x = 6. Now, on the same graph paper, draw the locus of the point which moves in such a way that its distance from the given line is always equal to 3 units.
On the graph, draw axis XOX’ and YOY’
Draw a line l, x = 6 which is parallel to y-axis
Take points P and Q which are at a distance of 3 units from the line l.
Draw lines m and n from P and Q parallel to l
With locus = 3, two lines can be drawn x = 3 and x = 9.
Chapter 16 - Loci (Locus and its Constructions) Exercise Ex. 16(B)
Describe the locus of a point at a distance of 3 cm from a fixed point.
The locus of a point which is 3 cm away from a fixed point is circumference of a circle whose radius is 3 cm and the fixed point is the centre of the circle.
Describe the locus of a point at a distance of 2 cm from a fixed line.
The locus of a point at a distance of 2 cm from a fixed line AB is a pair of straight lines l and m which are parallel to the given line at a distance of 2 cm.
Describe the locus of the centre of a wheel of a bicycle going straight along a level road.
The locus of the centre of a wheel, which is going straight along a level road will be a straight line parallel to the road at a distance equal to the radius of the wheel.
Describe the locus of the moving end of the minute hand of a clock.
The locus of the moving end of the minute hand of the clock will be a circle where radius will be the length of the minute hand.
Describe the locus of a stone dropped from the top of a tower.
The locus of a stone which is dropped from the top of a tower will be a vertical line through the point from which the stone is dropped.
Describe the locus of a runner, running around a circular track and always keeping a distance of 1.5 m from the inner edge.
The locus of the runner, running around a circular track and always keeping a distance of 1.5 m from the inner edge will be the circumference of a circle whose radius is equal to the radius of the inner circular track plus 1.5 m.
Describe the locus of the door handle as the door opens.
The locus of the door handle will be the circumference of a circle with centre at the axis of rotation of the door and radius equal to the distance between the door handle and the axis of rotation of the door.
Describe the locus of a point inside a circle and equidistant from two fixed points on the circumference of the circle.
The locus of the points inside the circle which are equidistant from the fixed points on the circumference of a circle will be the diameter which is perpendicular bisector of the line joining the two fixed points on the circle.
Describe the locus of the centers of all circles passing through two fixed points.
The locus of the centre of all the circles which pass through two fixed points will be the perpendicular bisector of the line segment joining the two given fixed points.
Describe the locus of vertices of all isosceles triangles having a common base.
The locus of vertices of all isosceles triangles having a common base will be the perpendicular bisector of the common base of the triangles.
Describe the locus of a point in space which is always at a distance of 4 cm from a fixed point.
The locus of a point in space is the surface of the sphere whose centre is the fixed point and radius equal to 4 cm.
Describe the locus of a point P so that:
, where A and B are two fixed
points.
The locus of the point P is the
circumference of a circle with AB as diameter and satisfies the condition .
Describe the locus of a point in rhombus ABCD, so that it is equidistant from
i) AB and BC
ii) B and D.
i)
The locus of the point in a rhombus ABCD which is equidistant from AB and BC will be the diagonal BD.
ii)
The locus of the point in a rhombus ABCD which is equidistant from B and D will be the diagonal AC.
The speed of sound is 332 meters per second. A gun is fired. Describe the locus of all the people on the Earth's surface, who hear the sound exactly one second later.
The locus of all the people on Earth's surface is the circumference of a circle whose radius is 332 m and centre is the point where the gun is fired.
Describe:
i) The locus of points at distances less than 3 cm from a given point.
ii) The locus of points at distances greater than 4 cm from a given point.
iii) The locus of points at distances less than or equal to 2.5 cm from a given point.
iv) The locus of points at distances greater than or equal to 35 mm from a given point.
v)The locus of the centre of a given circle which rolls around the outside of a second circle and is always touching it.
vi) The locus of the centers of all circles that are tangent to both the arms of a given angle.
vii) The locus of the mid-points of all chords parallel to a given chord of a circle.
viii) The locus of points within a circle that are equidistant from the end points of a given chord.
i) The locus is the space inside of the circle whose radius is 3 cm and the centre is the fixed point which is given.
ii) The locus is the space outside of the circle whose radius is 4 cm and centre is the fixed point which is given.
iii) The locus is the space inside and circumference of the circle with a radius of 2.5 cm and the centre is the given fixed point.
iv) The locus is the space outside and circumference of the circle with a radius of 35 mm and the centre is the given fixed point.
v) The locus is the circumference of the circle concentric with the second circle whose radius is equal to the sum of the radii of the two given circles.
vi) The locus of the centre of all circles whose tangents are the arms of a given angle is the bisector of that angle.
vii) The locus of the mid-points of the chords which are parallel to a given chords is the diameter perpendicular to the given chords.
viii) The locus of the points within a circle which are equidistant from the end points of a given chord is the diameter which is perpendicular bisector of the given chord.
Sketch and describe the locus of the vertices of all triangles with a given base and a given altitude.
Draw a line XY parallel to the base BC from the vertex A.
This line is the locus of vertex A of all the triangles which have the base BC and length of altitude equal to AD.
In the given figure, obtain all the points equidistant from the lines m and n; and 2.5 cm from O.
Draw an angle bisector PQ and XY of angles formed by the lines m and n. From O, draw arcs with radius 2.5 cm, which intersect the angle bisectors at a, b, c and d respectively.
Hence, a, b, c and d are the required four points.
A straight line AB is 8 cm long. Draw and describe the locus of a point which is:
i) always 4 cm from the line AB
ii) equidistant from A and B.
Mark the two points X and Y, which are 4 cm from AB and equidistant from A and B. Describe the figure AXBY.
(i)Draw a line segment AB = 8 cm.
(ii)Draw two parallel lines l and m to AB at a distance of 4 cm.
(iii)Draw the perpendicular bisector of AB which intersects the parallel lines l and m at X and Y respectively then, X and Y are the required points.
(iv)Join AX, AY, BX and BY.
The figure AXBY is a square as its diagonals are equal and intersect at 90o.
Angle and BA = BC = 8 cm.
The mid-points of BA and BC are M and N respectively. Draw and describe the
locus of a point which is:
i) equidistant from BA and BC.
ii) 4 cm from M
iii) 4 cm from N.
Mark the point P, which is 4 cm from both M and N, and equidistant from BA and BC. Join MP and NP, and describe the figure.
i) Draw an angle of with AB = BC = 8 cm
ii) Draw the angle bisector BX of
iii) With centre M and N, draw circles of radius equal to 4 cm, which intersects each other at P. P is the required point.
iv) Join MP, NP
BMPN is a rhombus since MP = BM = NB = NP = 4 cm
Draw a triangle ABC in which AB = 6 cm, BC = 4.5 cm and AC = 5 cm. Draw and label:
i) the locus of the centers of all circles which touch AB and AC.
ii) the locus of the centers of all circles of radius 2 cm which touch AB.
Hence, construct the circle of radius 2 cm which touches AB and AC.
Steps of Construction:
i) Draw a line segment BC = 4.5 cm
ii) With B as centre and radius 6 cm and C as centre and radius 5 cm, draw arcs which intersect each other at A.
iii) Join AB and AC.
ABC is the required triangle.
iv) Draw the angle bisector of
v) Draw lines parallel to AB and AC at a distance of 2 cm, which intersect each other and AD at O.
vi) With centre O and radius 2 cm, draw a circle which touches AB and AC.
Construct a triangle ABC, having given AB = 4.8 cm, AC = 4 cm and . Find a point P
i) inside the triangle ABC
ii) outside the triangle ABC
equidistant from B and C; and at a distance of 1.2 cm from BC.
Steps of Construction:
i) Draw a line segment AB = 4.8 cm
ii) At A, draw a ray AX making an angle of
iii) Cut off AC = 4 cm from AX
iv) Join BC.
ABC is the required triangle.
v) Draw two lines l and m parallel to BC at a distance of 1.2 cm
vi) Draw the perpendicular bisector of BC which intersects l and m at P and P’
P and P’ are the required points which are inside and outside the given triangle ABC.
Draw an angle . Find a point P such
that P is at a distance of 2 cm from AB and 1.5 cm from BC.
Steps of Construction:
i) Draw a ray BC.
ii) At B, draw a ray BA making an
angle of with BC.
iii) Draw a line l parallel to AB at a distance of 2 cm
iv) Draw another line m parallel to BC at a distance of 1.5 cm which intersects line l at P.
P is the required point.
Construct a triangle ABC, with AB = 5.6 cm, AC = BC = 9.2 cm. Find the points equidistant from AB and AC; and also 2 cm from BC. Measure the distance between the two points obtained.
Steps of Construction:
i) Draw a line segment AB = 5.6 cm
ii) From A and B, as centers and radius 9.2 cm, make two arcs which intersect each other at C.
iii) Join CA and CB.
iv) Draw two lines n and m parallel to BC at a distance of 2 cm
v) Draw the angle bisector of which intersects m and
n at P and Q respectively.
P and Q are the required points which are equidistant from AB and AC.
On measuring the distance between P and Q is 4.3 cm.
Construct a triangle ABC, with AB = 6 cm, AC = BC = 9 cm. Find a point 4 cm from A and equidistant from B and C.
Steps of Construction:
i) Draw a line segment AB = 6 cm
ii) With A and B as centers and radius 9 cm, draw two arcs which intersect each other at C.
iii) Join AC and BC.
iv) Draw the perpendicular bisector of BC.
v) With A as centre and radius 4 cm, draw an arc which intersects the perpendicular bisector of BC at P.
P is the required point which is equidistant from B and C and at a distance of 4 cm from A.
Ruler and compasses may be used in this question. All construction lines and arcs must be clearly shown and be of sufficient length and clarity to permit assessment.
i) Construct a triangle ABC, in
which BC = 6 cm, AB = 9 cm and angle ABC = 60.
ii) Construct the locus of all points inside triangle ABC, which are equidistant from B and C.
iii) Construct the locus of the vertices of the triangles with BC as base and which are equal in area to triangle ABC.
iv) Mark the point Q, in your construction, which would make triangle QBC equal in area to triangle ABC and isosceles.
v) Measure and record the length of CQ.
Steps of Construction:
(i) Draw a line segment BC = 6 cm.
(ii) At B, draw a ray BX making an angle 60 degree and cut off BA=9 cm.
(iii) Join AC. ABC is the required triangle.
(iv) Draw perpendicular bisector of BC which intersects BA in M, then any point on LM is equidistant from B and C.
(v) Through A, draw a line m || BC.
(vi) The perpendicular bisector of BC and the parallel line m intersect each other at Q.
(vii) Then triangle QBC is equal in area to triangle ABC. m is the locus of all points through which any triangle with base BC will be equal in area of triangle ABC.
On measuring CQ = 8.4 cm.
State the locus of a point in a rhombus ABCD, which is equidistant
i) from AB and AD;
ii) from the vertices A and C.
Steps of Construction:
i) In rhombus ABCD, draw angle
bisector of which meets
in C.
ii) Join BD, which intersects AC at O.
O is the required locus.
iii) From O, draw and
In
( AC is bisector of angle A)
AO = OA (Common)
Therefore, O is equidistant from AB and AD.
Diagonal AC and BD bisect each other at right angles at O.
Therefore, AO = OC
Hence, O is equidistant from A and C.
Use a graph paper for this question. Take 2 cm = 1 unit on both the axes.
i) Plot the points A(1,1), B(5,3) and C(2,7).
ii) Construct the locus of points equidistant from A and B.
iii) Construct the locus of points equidistant from AB and AC.
iv) Locate the point P such that PA = PB and P is equidistant from AB and AC.
v) Measure and record the length PA in cm.
Steps of Construction:
i) Plot the points A(1,1), B(5,3) and C(2,7) on the graph and join AB, BC and CA.
ii) Draw the perpendicular bisector of AB and angle bisector of angle A which intersect each other at P.
P is the required point.
Since P lies on the perpendicular bisector of AB.
Therefore, P is equidistant from A and B.
Again,
Since P lies on the angle bisector of angle A.
Therefore, P is equidistant from AB and AC.
On measuring, the length of PA = 5.2 cm
Construct an isosceles triangle ABC such that AB = 6 cm, BC=AC=4cm. Bisect angle C internally and mark a point P on this bisector such that CP = 5cm. Find the points Q and R which are 5 cm from P and also 5 cm from the line AB.
Steps of Construction:
i) Draw a line segment AB = 6 cm.
ii) With centers A and B and radius 4 cm, draw two arcs which intersect each other at C.
iii) Join CA and CB.
iv) Draw the angle bisector of angle C and cut off CP = 5 cm.
v) A line m is drawn parallel to AB at a distance of 5 cm.
vi) P as centre and radius 5 cm, draw arcs which intersect the line m at Q and R.
vii) Join PQ, PR and AQ.
Q and R are the required points.
Plot the points A(2,9), B(-1,3) and C(6,3) on a graph paper. On the same graph paper, draw the locus of point A so that the area of triangle ABC remains the same as A moves.
Steps of construction:
i) Plot the given points on graph paper.
ii) Join AB, BC and AC.
iii) Draw a line parallel to BC at A and mark it as CD.
CD is the required locus of point A where area of triangle ABC remains same on moving point A.
Construct a triangle BPC given BC
= 5 cm, BP = 4 cm and .
i) complete the rectangle ABCD such that:
a) P is equidistant from AB and BCV
b) P is equidistant from C and D.
ii) Measure and record the length of AB.
i) Steps of Construction:
1) Draw a line segment BC = 5 cm
2) B as centre and radius 4 cm draw an arc at an angle of 45 degrees from BC.
3) Join PC.
4) B and C as centers, draw two perpendiculars to BC.
5) P as centre and radius PC, cut an arc on the perpendicular on C at D.
6) D as centre, draw a line parallel to BC which intersects the perpendicular on B at A.
ABCD is the required rectangle such that P is equidistant from AB and BC (since BD is angle bisector of angle B) as well as C and D.
ii) On measuring AB = 5.7 cm
Use ruler and compass only for the following question. All construction lines and arcs must be clearly shown.
i. Construct a ΔABC in which BC = 6.5 cm, ∠ABC = 60°, AB = 5 cm.
ii. Construct the locus of points at a distance of 3.5 cm from A.
iii. Construct the locus of points equidistant from AC and BC.
iv. Mark 2 points X and Y which are at a distance of 3.5 cm from A and also equidistant from AC and BC. Measure XY.
i. Steps of construction:
1. Draw BC = 6.5 cm using a ruler.
2. With B as center and radius equal to approximately half of BC, draw an arc that cuts the segment BC at Q.
3. With Q as center and same radius, cut the previous arc at P.
4. Join BP and extend it.
5. With B as center and radius 5 cm, draw an arc that cuts the arm PB to obtain point A.
6. Join AC to obtain ΔABC.
ii. With A as center and radius 3.5 cm, draw a circle.
The circumference of a circle is the required locus.
iii. Draw CH, which is bisector of Δ ACB. CH is the required locus.
iv. Circle with center A and line CH meet at points X and Y as shown in the figure. xy = 8.2 cm (approximately)
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