Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

Theorems

Theorem 6.1
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Theorem 6.6

Theorem 6.2 Important Deleted for CBSE Board 2024 Exams

Theorem 6.3 Deleted for CBSE Board 2024 Exams

Theorem 6.4 Deleted for CBSE Board 2024 Exams

Theorem 6.5 Important Deleted for CBSE Board 2024 Exams

Theorem 6.7 Important Deleted for CBSE Board 2024 Exams

Theorem 6.8 Deleted for CBSE Board 2024 Exams

Chapter 6 Class 9 Lines and Angles

Serial order wise

Last updated at May 29, 2023 by Teachoo

Theorem 6.1 :- If two lines intersect each other, then the vertically opposite angles are equal. Given :- Two lines AB and CD intersecting at point O. To Prove :- Vertically opposite angles are equal i.e, AOC = BOD and AOD= BOC Proof :- From (1) and (2) AOC + BOC = AOD + AOC BOC = AOD Now, To prove BOD = AOC From (3) and (4) AOD + BOD = AOD + AOC BOD = AOC Hence, Vertically Opposite angles are equal.