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Geometry 6 Online
OpenStudy (anonymous):

Decide if you are given enough information to prove that the quadrilateral is a parallelogram. Consecutive angles are supplementary.

jimthompson5910 (jim_thompson5910):

Hint: Imagine you have two lines m and n. They are then cut by a transversal line. Now call two angles on the same side and on the interior angles p and q. If p and q are supplementary, then the lines p and q are parallel by the same side interior angles converse this is shown in the diagram below |dw:1367293907802:dw|

jimthompson5910 (jim_thompson5910):

|dw:1367294025116:dw|

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