Question

Prove that the sum of all interior angles of a trangle is 180° ?

Answer 1

hey buddy your question is wrong the question can be prove that the sum of the angles of a equilateral triangle is 180 degree or each angle is 60 degree. hope it helps please mark as brainliest.

Answer 2

Angle D + E + B = 180 (linear pair)               3
but Angle D = A            (A.I.A)        1
and Angle E = C           (A.I.A)         2
Using 1 and 2 in eq. 3, we get 
Angle A + B + C = 180