# In triangle AOB, side OA is equal to side AB. The length of the AB side is 24mm.

June 26, 2021 | education

| **In triangle AOB, side OA is equal to side AB. The length of the AB side is 24mm. What is the length of the OB side if the perimeter of the triangle is 84 mm?**

1. Let us find the sum of the sides OA and AB, if it is known that these sides are equal and the length of the side AB is 24 mm.

24 cm * 2 = 48 mm.

2. Let’s calculate the length of the OB side if the perimeter of the triangle is 84 mm.

84 – 48 = 36 mm.

Answer: The length of the OB side is 36 cm.

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