SOLUTION: Always, sometimes, or never; If the opposite angles of a quadrilateral are supplementary, the quadrilateral is a parallelogram
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Question 242792: Always, sometimes, or never; If the opposite angles of a quadrilateral are supplementary, the quadrilateral is a parallelogram Answer by Edwin McCravy(20060) (Show Source):
You can put this solution on YOUR website! Always, sometimes, or never; If the opposite angles of a quadrilateral are supplementary, the quadrilateral is a parallelogram.
When and only when the quadrilateral is a parallelogram which is also
a rectangle and the opposite angles are both 90°. Two right angles
are supplementary.
So the answer is "sometimes".
Edwin
