Cyclic quadrilateral: opposite angles

An example figure from the Circle Generator.

A quadrilateral ABCD with all four corners on a circle; the angle at C is labeled 95° and the opposite angle at A is labeled x — A quadrilateral ABCD drawn inside a circle with all four corners on it, the circle’s center not shown. The angle at C is marked and labeled 95°, and the opposite angle at A is marked and labeled x, for the opposite angles of a cyclic quadrilateral.

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Answer key

x = 85°

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