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If an exterior angle of a cyclic quadrilateral be 50°, then the interior opposite angles is :

130°

40°

50°

90°

Explanation:

∠ABC + ∠ADC = 180°]
∠CBE = 50°
∴ ∠ABC = 180° – ∠CBE = 180° – 50° = 130°
∴ ∠ADC = 180° – ∠ABC = 180° – 130° = 50°

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