Question

prove that the sum of three angle of a triangle 180 dgree​

Answer 1

Answer:

Knowing that the alternate interior angles are equal lets you substitute the angles of the triangle for the angles of the line. Thus we get, Angle ABC + angle BAC + angle ACB = 180°. In other words, in the triangle ABC, angle B + angle A + angle C = 180°. Thus, the sum of all the angles of a triangle is 180°.