# Calculate the perimeter of the triangle if the length of one side is 7 cm, the length of the second

May 30, 2021 | education

| **Calculate the perimeter of the triangle if the length of one side is 7 cm, the length of the second is 13 cm and the third side is shorter than the second by 3 cm.**

Given:

a = 7 cm;

b = 13 cm;

c = 3 cm less than b;

P =? cm.

A triangle is a geometric shape, a polygon, with three sides. The sum of the lengths of all its sides is called the perimeter of the triangle. Let’s calculate the perimeter of the triangle using the formula P = a + b + c.

Let’s calculate the side with:

1) 13 – 3 = 10 (cm)

P = 7 + 13 + 10 = 30 (cm)

Answer: 30 cm perimeter of the triangle.

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