If the perimeter of an equilateral triangle is 15 cm, what is the length of each side?

The answer is 5 because a triangke has 3 sides sp u do 15 / 3 which is 5

The perimeter of a triangle is the sum of its 3 sides, also, for a equilateral triangle, its sides are equal by definition, so if we call the side length of the triangle x, then we have:

x + x + x = 15

3x = 15

then we divide both sides of the equation by 3

x = 15/3

x = 5

therefore each side of the triangle is 5 cm