Question

1. Prove that the sum of the three angles of a triangle is 180°( How to write in exam)....​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

We know that exterior angle of triangle is equal to sum of opposite interior angle.

In triangle ABC,

Angle ACB+angle ACD=180° according to linear pair, - - - - - - - ----1

And angle ACD = angle ABC +angle BAC - - - - - - 2

So, from 1&2,

Angle ACB+angle ACD=180°

Angle ACB+angle ABC +angle BAC=180°

HENCE PROVED.