Class 9 maths NCERT solutions - Lines and Angles In this article, we will learn the properties of the angle formed when two lines intersect each other and also the properties of the angle formed when a line intersects two or more parallel lines at distinct points. Linear pair axiom If a ray stands on a line, then the sum of the two adjacent angles so formed is 180⁰ and vice Vera. This property is called as the linear pair axiom If a ray stands on a line, then the sum of two adjacent angles so formed is 180⁰. If the sum of two adjacent angles is 180⁰ than the non-common arms of the angles from a line. As per Class 9 Maths syllabus, we will now discuss few theorems: Theorem 1:- If two lines intersect each other than the vertically opposite angles are equal Given: – AB and CD are two intersecting lines at O. Two vertically opposite angles as below <AOC and <BOD <AOD and <BOC To prove :-<AOC=<BOD and <AOD -<BOC Proof: – Ray OA s
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