Question

prove that each angle of a equilateral triangle is 60degree

Answer 1

Let the angles be X

x+x+x=180(sum of angles of a triangle)
3x=180
x=180/3
x=60

Answer 2

Let the three side of the triangle be X
sum of sides of traingle = X+X+X
= 3X
since sum of all the sides of traingle is 180°
3X = 180°
X=60°

Hence proved...