The perimeter of the triangle is 11 cm. One side is x cm, the second is 3 cm, and the third is 5 cm. Find the unknown side.

univerkov | July 29, 2021 | education

Taking one of the sides of the triangle as X, we compose and solve the equation:

X + 3 + 5 = 11;

X + 8 = 11;

X = 11 – 8;

X = 3 (cm) – one of the sides of the triangle.

Let’s check the solution of the equation:

3 + 3 + 5 = 11;

11 = 11.

Answer: one of the sides of the triangle is 3 cm.

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