Geometry Problem 1286 Triangle, Quadrilateral, 60, 135, 105 Degree Angles, Congruence, Measurement

Geometry Problem. Post your solution in the comment box below.
Level: Mathematics Education, High School, Honors Geometry, College.

This entry contributed by Sumith Peiris, Moratuwa, Sri Lanka.

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Problem 405. Quadrilateral, 60, 75, and 135 degrees, Midpoint

Proposed Problem
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Complete Problem 405
Level: High School, SAT Prep, College geometry