The answer is 24cm. Because a triangle has 3 sides, and the triangle is equilateral, which means all the sides of the triangle are equal. So since all 3 sides add up to 72cm, we can do 72/3 which is 24. Each side of the triangle is 24cm
So a triangle has 3 sides and it is an equilateral triangle so each side should have the same length. The perimeter is 72 cm and that means we have to divide 72 by 3 and that equals 24cm.
