# Quadrilateral ABCD is inscribed in circle O. What is m∠A ?

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Tony B
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Mar 6, 2018

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ABCD can be considered as two triangles back to back. The sum of the internal angles of a triangle is

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Add 5 to both sides

Divide both sides by 5

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But

Subtract 42 from both sides (37+5=42)

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