# CBSE Class 9 Maths Basic Concepts Of Geometry

## Videos

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- The supplement of an angle is one fifth of itself . Determine angle and supplement
- Lines AB and CD intersect at O. If angle AOC+ angle BOE= 70 degree and angle BOD = 40 degree , find angle BOE and reflex angle COE
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- 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

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