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CBSE Class 9 Answered

In a triangle ABC ,30A+6B=5C. determine angle A,AngleB and Angle C
Asked by gpnkumar0 | 05 Sep, 2016, 08:58: PM
answered-by-expert Expert Answer
begin mathsize 16px style In space increment ABC comma 30 straight A plus 6 straight B equals 5 straight C Divide space both space sides space by space 5 comma space we space get 6 straight A plus 1.2 straight B equals straight C rightwards double arrow straight C equals left parenthesis straight A plus straight B right parenthesis plus left parenthesis 5 straight A plus 0.2 straight B right parenthesis rightwards double arrow straight C greater than left parenthesis straight A plus straight B right parenthesis straight A space and space straight B space are space positive comma space rightwards double arrow straight C greater than straight A plus straight B We space know space that space sides space opposite space greater space angles space are space greater comma space that space is comma space AB greater than BC plus AC. This space is space not space possible comma space since space in space straight a space triangle comma space the space sum space of space any space two space sides space is space always space greater space than space the space third space side. So comma space there space is space no space such space triangle space that space exists space with space the space given space relation. end style
Answered by Rebecca Fernandes | 05 Sep, 2016, 10:08: PM

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CBSE 9 - Maths
triangle ABC is an equilateral triangle, AB = 6cm. the points P,Q and R are midpoints of AB BC, CA respectively . the perimeter of □ PBCR is
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Asked by ghodage | 12 Dec, 2023, 07:23: PM
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CBSE 9 - Maths
the area of an equilateral triangle is 49√3 sq.cm, it's perimeter is
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CBSE 9 - Maths
M is a point inside a square ABCD. AMCD is equilateral triangle and MC cuts diagonal DB at E. Then, ZBEC=..... (1) 75° (3) 105° (2) 90° (4) 60°
Asked by Krishna962511 | 23 Jan, 2023, 10:41: AM
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CBSE 9 - Maths
In fig. 12.116 , T is a point on the side QR of ∆ PQR and S is a point such that RT=St. Prove that PQ+PR>QS
Asked by shivendrasinghfauzdar | 09 Oct, 2021, 11:30: AM
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CBSE 9 - Maths
In the figure, ABCD is a square and PAB is a triangle such that AQ = BR. Prove that DPQR is an isosceles triangle.
Asked by thebeatinbrat | 01 Oct, 2021, 08:56: PM
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CBSE 9 - Maths
If the vertex angle of an isosceles triangle is 50° ,find the other angels   
Asked by chikkammac24212 | 21 Aug, 2019, 07:48: PM
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CBSE 9 - Maths
show that BX=CY.
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Asked by shubham0kumar24 | 19 May, 2019, 12:44: PM
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CBSE 9 - Maths
AD is an altitude of an isosceles triangle ABC in which AB=AC.Show that  ( i )AD bisects BC (ii) AD bisects angle A.
Asked by Nagu.sahukar1543 | 14 Nov, 2018, 08:11: AM
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CBSE 9 - Maths
If the segments drawn perpendicular to the two sides of a triangle from the mid point of the third side be congruent and equally inclined to the third side, prove that the triangle is isosceles.
Asked by Topperlearning User | 10 Aug, 2017, 01:53: PM
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CBSE 9 - Maths
If the altitudes from two vertices of a triangle to the opposite sides are equal, prove that the triangle is isosceles.
Asked by Topperlearning User | 10 Aug, 2017, 01:56: PM
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