Geometry Problem 104. Angles, Triangle, Quadrilateral. Level: High School, Honors Geometry, College, Mathematics Education

In the figure below, given a quadrilateral ABCD, angle ABD = 2a , angle DBC = 90 - a , angle ADB = 2b , and angle BDC = 90 - b . Prove that angle AEB = 90 + b - a
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