Right trapezoid: find the slanted side

An example figure from the Trapezoid Generator.

A right trapezoid with bases 15 and 9, a vertical leg of 8 and the slanted leg labeled x — A right trapezoid ABCD with its bases labeled 15 along the bottom and 9 along the top, marked parallel with one arrow each. The left leg DA is labeled 8 and meets both bases at right angles; the slanted leg BC is labeled x.

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Answer key

Sides: AB = 15, BC = 10, CD = 9, DA = 8
Angles: ∠A = 90°, ∠B = 53.1°, ∠C = 126.9°, ∠D = 90°
Perimeter: 42
Area: 96

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