# The perimeter of the triangle ABC is 19.3 cm. AC = 7.9 cm. The AB side is 2 times shorter than the BC side. Find the BC side.

July 27, 2021 | education

| We will assume that the side of triangle AB is equal to x, then the side of BC will be (2 * x). The perimeter is equal to the sum of the three sides, it is 19.3 cm.We get the equation:

x + 2 * x + 7.9 = 19.3;

3 * x = 11.4;

x = 11.4 / 3;

x = 3.8 cm – the length of the side AB.

Determine the length of the side BC:

BC = 2 * x = 2 * 3.8 = 7.6 cm.

Examination:

3.8 + 7.6 + 7.9 = 19.3.

Answer: The side of triangle BC is 7.6 centimeters.

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