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30 June, 07:26

Quadrilateral abcd is inscribed in this circle. What is the measure of ∠a? C is 43.

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  1. 30 June, 07:39
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    opposite angles are supplements (equal to 180°).

    ∠a + ∠c = 180°

    ∠a + 43° = 180°

    ∠a = 137°
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