Online Geometry. Math teacher Master Degree.
 Problem 33. Triangle and Quadrilateral. Level: High School, SAT Prep, College geometry

The figure shows a right triangle BAD, mÐ ABD = mÐ DCE = x, and mÐ BAC = 2 mÐ BDC. Prove that x = 45º.
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Quadrilateral, Angle, 45 degrees
 

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