Find the measurement of the missing angle of this quadrilateral.

Pierre C asked Jun 15, 2023

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Pierre C asked Jun 15, 2023

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24 votes

Answer:

x= 81°

Explanation:

the interior angles of a quadrilaterial add up to 360°

143+80+56+x=360

condense left side: 279+x=360

isolate x: 279-279+x=360-279

x= 81°

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