Question

show that sum of three angles of any triangle is 180 degree

Answer 1

There is a formula for finding the interior angle sum of any polygon. That is (sides-2)180°
in triangle side is three so,
=(3-2)180°
=1*180°
=180°
You can show it in another way also.

Hope it will help you!

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Answer 2

I think it will work........
.