Question
ABCD is a cyclic quadrilateral, such that ratio of
measures ∠A, ∠B and ∠C is 1 : 4 : 5, then the measure of ∠D is.Solution
The sum of the opposite angles in cyclic quadrilateral is 180° ∠A = 1x ∠B = 4x ∠C = 5x ∠A + ∠C = 180° 1x + 5x = 180° x = 30° ∠B = 4 × 30° = 120° ∠B + ∠D = 180° 120° + ∠D = 180° ∠D = 60°
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