In a cyclic quadrilateral ABCD, the angle A is 100°. What is the measure of the angle C?
80°
Property of a cyclic quadrilateral: Opposite angles are supplementary, i.e. \(\angle A + \angle C = 180^\circ\) and \(\angle B + \angle D = 180^\circ\).
Apply: \(\angle A = 100^\circ \implies \angle C = 180^\circ - 100^\circ = 80^\circ\).
Hence, the correct answer is 80°.
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