In a rectangular trapezoid, the base is 17 cm, the middle line is 12 cm. Find another base.

univerkov | August 22, 2021 | education

For the solution, we use the formula for the midline of the trapezoid, which is equal to the half-sum of the lengths of the bases.

KM = (BC + AD) / 2.

Then, 2 * KM = BC + AD.

BC = 2 * KM – AD = 2 * 12 – 17 = 24 – 17 = 7 cm.

Answer: The length of the second base is 7 cm.

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