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• CBSE×
• Class 9×
• Mathematics×
• Lines And Angles×
• Basic Concepts Of Geometry×

# Basic Concepts Of Geometry Free Doubts and Solutions

## A graph may be defined as a set of points connected by lines called edges. Every edge connects a pair of points. Thus a triangle with 3 edge and 3 points. The degree of a point is the number of the edges connected to it. For example, a triangle is a graph with 3 points of degree 2 each. Consider a graph with 12 points. It is possible to reach from any other point through a sequence of edges. The number of edges, e, in the graph must satisfy the condition:- a) 11 ≤ e ≤ 66 b) 11 ≤ e ≤ 65 c) 10 ≤ e ≤ 66 d) 0 ≤ e ≤ 11

Asked by acv27joy 8th October 2018, 10:55 PM

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## 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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## Q1. Whatis the history of lines and angles

Asked by vikasg13.hardware 23rd June 2017, 8:38 AM

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## 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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## 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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## 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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## 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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## 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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## what are trisect angles

Asked by sanatkothari99 24th July 2014, 4:04 PM

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

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## 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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## 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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## 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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## In fig., find the value of x.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## In given figure, OA, OB are opposite rays and

Asked by Topperlearning User 4th June 2014, 1:23 PM

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

Asked by Topperlearning User 4th June 2014, 1:23 PM

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

Asked by Topperlearning User 4th June 2014, 1:23 PM

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

Asked by Topperlearning User 4th June 2014, 1:23 PM

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

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## 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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## An angle is of its complement. Find the angles.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## 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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## 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.

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

Asked by Topperlearning User 4th June 2014, 1:23 PM

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

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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## 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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## 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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## 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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