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.
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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