Parallelogram? Why So? (GoGeometry Action 77)

Dynamic and modifiable illustration of another simple scenario that always gives rise to a parallelogram. Question is: WHY? (Credit: Antonio Gutierrez)
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Tim Brzezinski —

 
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ccss  ccss.hsg.co.c.11  common  common-core  congruence  congruent-angles  congruent-triangles  core  diagonal  midpoint  parallelogram parallelogram-theorems practice problem-set-problem problem-set-problems triangles Vis mere…
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