Question

prove that the sum of the angles of triangle is 180​

Answer 1

Proof that the sum of the angles in a triangle is 180 degrees. If ABC is a triangle then <)ABC + <)BCA + <)CAB = 180 degrees. 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'.

Answer 2

Answer:

One side of an equilateral triangle is equal to 60°. As we all know that triangles have three sides, therefore we multiply 60 by 3 which will give us the sum of a triangle that is equal to 180°.