Question

prove that sum of the angles of triangle is 180degree

Answer 1

HEY MATE HERE IS YOUR ANSWER

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Above it is a equilateral triangle

Its each side we take as "x"

X+x+x= 180 because sum of all angles of triangle is 180

3x=180x=180/3
X=60

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Answer 2

The above data will prove that the sum of all the interior angles of a triangle is 180 degree.
If you are not satisfied then ask for another method.