Quadrilateral With Opposite Angles Congruent

Applet is designed to accompany a class activity I authored. Yet it can be easily used to quickly have students discover that if both pairs of opposite angles of a quadrilateral are congruent, then that quadrilateral is a parallelogram.
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Tim Brzezinski —

 
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angle  angles  ccss  ccss.hsg.co.c.11  common  common-core  congruent  core  discovery  opposite  parallelogram quadrilateral theorem Više...
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