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Mathematics 20 Online
OpenStudy (anonymous):

quadrilateral abcd is a parallelogram. which two angles are supplementary?

OpenStudy (mathstudent55):

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OpenStudy (mathstudent55):

In the figure above, line m and n are parallel. Angles 1 and 2 are supplementary. Angles 3 and 4 are supplementary. In other words, when parallel lines are cut by a transversal, same-side interior angles are supplementary. Now look for a similar situation in the parallelogram.

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