The perimeter of the triangle is 46 cm. The length of one side is 9 cm and the length of the other is 15 cm.

The perimeter of the triangle is 46 cm. The length of one side is 9 cm and the length of the other is 15 cm. Find the length of the third.

First, we find the sum of the lengths of the known sides:

9 + 15 = 24 (cm) – two sides together;

Since the perimeter of a triangle is the sum of the lengths of all its sides, we subtract the sum of the lengths of the two sides from the perimeter and get the third side:

46 – 24 = 22 (cm) – third party.

Answer: 22cm third side length.