# In triangle ABC, sides AB and BC are equal. The AC side is 15 cm. The perimeter of the triangle is 65 cm.

September 24, 2021 | education

| **In triangle ABC, sides AB and BC are equal. The AC side is 15 cm. The perimeter of the triangle is 65 cm. What is the length of the AB side?**

From the condition of the problem, the perimeter of the triangle and the length of one of its sides – the base – are known, and since it is isosceles, the sides are equal. Let’s answer the question of the problem and define the AB side.

(65 – 15) / 2 = 50/2 = 25 centimeters.

Answer: 25 centimeters.

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