Problem 403. Circular sector, 90 degrees, Circle, Semicircle, Area.
Level: High School, College, SAT Prep. The figure shows a circular sector AOB of 90 degrees and a semicircle of diameter OB. Circle D is tangent to OA and arcs AB and OB. If S, S_{1}, S_{2}, and S_{3}, are the shaded areas, prove that S = S_{1} + S_{2} + S_{3}.

Recent Additions
