If opposite angles of a quadrilateral are supplementary, then the quadrilateral is...
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Problem
If opposite angles of a quadrilateral are supplementary, then the quadrilateral is a parallelogram.
Step-by-step solution
A quadrilateral is a parallelogram if and only if its opposite angles are equal. If opposite angles are supplementary, it means they add up to 180 degrees. This condition is not sufficient to guarantee a parallelogram.
Answer
False