If two lines intersect each other then vertically opposite angles are equal | Theorem 6.1

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Theorem 6.1 class 9
If two lines intersect each other, then the vertically opposite angles are equal.
This well help in solving problems of Exercise 6.1 class 9

Hint:
Let AB and CD be two lines intersecting at O
Ray OA stands on line CD
∠AOC + ∠AOD = 180 due to linear pair
Hence, proved

Note📝
The above theorem is taken from NCERT class 9 chapter Lines and Angles

Practise📝:
Exercise 6.1 class 9

Basic concepts of lines and angles.

Lines and Angles

Revise✍🏻:
Number Systems

Polynomials

Connect with us 🤩:

#linesandangles #class9maths #ncert

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