An equilateral triangle has a perimeter of 129 in. What is the length of each side of the triangle? The length of each side of the triangle is __in.

Answer 1

An equilateral triangle has 3 equal sides and 3 equal angles.

P = x + x + x = 3x

Given P = 129 inches, then 3x = 129 => x = 129/3 = 43 inches