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Basic Concepts Of Geometry Free Doubts and Solutions

CBSE - IX - Mathematics - Lines and Angles

prove that the bisector of two adjacent supplementory angles from a right angle

Asked by sbidipak 27th June 2017, 4:56 PM
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CBSE - IX - Mathematics - Lines and Angles

Q1. Whatis the history of lines and angles

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CBSE - IX - Mathematics - Lines and Angles

Two complementary angles are such that two times the measure of one angle is equal to three times the measure of the other. find the measure of the smaller angle.............

Asked by eeshan.nk 18th July 2016, 4:20 PM
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CBSE - IX - Mathematics - Lines and Angles

An angle is equal to 3 times its complement. Find its measure.
 

Asked by atharvakute 7th July 2016, 7:56 PM
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CBSE - IX - Mathematics - Lines and Angles

If angle A and B form a linear pair and angle A - B= 100. Find angle A & B.
 

Asked by atharvakute 7th July 2016, 7:54 PM
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CBSE - IX - Mathematics - Lines and Angles

Prove that two distinct lines cannot have more than one point in common.

Asked by kousikroyr20 10th September 2015, 11:42 PM
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CBSE - IX - Mathematics - Lines and Angles

i am totally confused in proofs please give some easy ways to analize the diagram and to prove it
 

Asked by sanatkothari99 26th July 2014, 3:45 PM
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CBSE - IX - Mathematics - Lines and Angles

what are trisect angles
 

Asked by sanatkothari99 24th July 2014, 4:04 PM
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CBSE - IX - Mathematics - Lines and Angles

In fig., if y = 20°, prove that the line AOB is a straight line.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

In the figure, POR and QOR form a linear pair. If b - a = 60°, find the value of a and b.

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CBSE - IX - Mathematics - Lines and Angles

Lines PQ and RS intersect each other at point O. If POR: ROQ= 5:7, find all the remaining angles.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

In fig., OP bisects AOC, OQ bisects BOC and OPOQ. Show that points A, O and B are collinear.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

In fig, if POR and QOR form a linear pair and a - b = 80° then find the value of a and b.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

In fig., find the value of x.

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CBSE - IX - Mathematics - Lines and Angles

In given figure, OA, OB are opposite rays and

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

In fig., two straight lines AB and CD intersect each other at O. If COE = 70o, find the values of a, b and c.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

If two lines are perpendicular to the same line, prove that they are parallel to each other.

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CBSE - IX - Mathematics - Lines and Angles

In fig., lines l and m intersect each other at O. If x = 40o then, find the value of y, z and w.

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CBSE - IX - Mathematics - Lines and Angles

Prove that if two lines intersect, the vertically opposite angles are equal.

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CBSE - IX - Mathematics - Lines and Angles

In figure, if x : y = 3 : 7, then find the value of x,y,z and w.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

In figure, lines AB and CD intersect at O. If AOD : DOC = 4 : 5, then find COB

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CBSE - IX - Mathematics - Lines and Angles

If x + y = s + w, prove that AOB is straight line.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

An angle is of its complement. Find the angles.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

In figure, POQ is a line, ray OR is perpendicular to line PQ. OS is another ray lying between rays OP and OR. Prove that ROS = .

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

In fig., ray OC stands on the line AB, ray OL and ray OM are angle bisector of AOC and BOC respectively. Prove that LOM = 90o.

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CBSE - IX - Mathematics - Lines and Angles

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

ACB is a straight line. CE and CD are rays making angles with the line such that angle ACE is double the angle DCB and angle ECD is thrice that of angle DCB. Find each of these angles.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

AB and CD intersect at O. If AOD: BOD = 5: 7, find all the angles.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

In the figure, POQ is a line. Ray OR is perpendicular to PQ. OS is another ray lying between rays OP and OR. Prove that ROS =

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

The measure of an angle is twice the measure of its supplementary angle. Find its measure.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

Given that each of the angles AOC and AOB is a right angle. Show that BOC is a straight line.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

Prove that if a ray stands on a line, then the bisectors of the two adjacent angles so formed are perpendicular to each other.

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CBSE - IX - Mathematics - Lines and Angles

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - IX - Mathematics - Lines and Angles

Two angles are adjacent, if they have a common vertex and a common arm. This is the complete definition of adjacent angles. Is this statememt true or false?

Asked by Ayan Biswas 24th May 2014, 2:31 PM
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CBSE - IX - Mathematics - Lines and Angles

Two angles are adjacent, if they have a common vertex and a common arm. This is the complete definition of adjacent angles. Is this statememt true or false?

Asked by Ayan Biswas 24th May 2014, 2:31 PM
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CBSE - IX - Mathematics - Lines and Angles

Asked by Topperlearning User 3rd December 2013, 2:16 AM
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CBSE - IX - Mathematics - Lines and Angles

In given figure, if a ray OC stands on line AB such that then show that

Asked by Topperlearning User 3rd December 2013, 2:02 AM
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CBSE - IX - Mathematics - Lines and Angles

Asked by Topperlearning User 30th April 2013, 8:51 AM
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