SOLUTION: Describe a method for verifying that quadrilateral EFGH is a parallelogram if only the interior angle measures of EFGH are known.

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Question 797705: Describe a method for verifying that quadrilateral EFGH is a parallelogram if only the interior angle measures of EFGH are known.

Answer by solver91311(24713) About Me  (Show Source):
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EFGH is a parallelogram if and only if the opposite interior angles are pairwise equal.

John

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