# The perimeter of the triangle is 186mm. The length of one side is 42mm, the second is twice as long

September 15, 2021 | education

| **The perimeter of the triangle is 186mm. The length of one side is 42mm, the second is twice as long. What is the third side of the triangle?**

Let the lengths of the sides of the triangle be a, b, c see.

By condition, a = 42 mm.

Determine the length of side b.

b = a * 2 = 42 * 2 = 84 mm.

Determine the length of the side with.

c = a – 3 = 13 – 3 = 10 mm.

The perimeter of a triangle is equal to the sum of the lengths of its sides.

P = a + b + c;

186 = 42 + 84 + с;

C = 186 – 42 – 84;

C = 60 mm.

Answer: The length of the third side is 60 mm.

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