Question

Prove the sum of angle of a triangle is 180 degree​

Answer 1

Answer:

If ABC is a triangle then <ABC + <BCA + <CAB = 180 degrees.

Step-by-step explanation:

Draw line a through points A and B. Draw line b through point C and parallel to line a.

Since lines a and b are parallel,

<BAC = <B'CA and <ABC = <BCA'.

It is obvious that <B'CA + <ACB + <BCA' = 180 degrees.

Thus <ABC + <BCA + <CAB = 180 degrees.

Answer 2

I hope this will help you