Question

Prove that the sum of three angles of a triangle is 180°.

Answer 1

draw a line XY passing through A parellel to BC
angle ABC = angle XAB ( alternate interior angles)
angle ACB = angle YAC ( alternate interior angles)
angle XAB + angle YAC + angle A = 180 degrees ( straight angle)
angle ABC + angle ACB + angle A = 180 degree
hence proved

Answer 2

angles of triangle = 180 degrees

so all the sides of the triangle will be xcm

=> x+x+x=180

=>3x=180

=>x=180/3

=>x=60 degrees

so now if we will add 60 three times then the sum will be 180 degrees

so now pls make it brainliest