Find the perimeter of the triangle in which one side is 8cm, the second is 3cm and the third is 5cm.

1. To solve this problem, you will not need the following formulas:

The formula for the perimeter of a triangle: P = a + b + c, where a, b, c are the sides of the triangle.

2. Let’s use the formula for finding the perimeter of a triangle and substitute in it known quantities such as the first side a = 8 cm, the second side is 3 cm and the third side is 5 cm, and then we get:

P = a + b + c = 8 cm + b + c = 8 cm + 3 cm + c = 8 cm + 3 cm + 5 cm = 11 cm + 5 cm = 16 cm.

Answer: the perimeter of this triangle with sides of 8 cm, 3 cm and 5 cm is 16 cm.