
Problem 192.
Circle, Diameter, Chord, Perpendicular, Triangle, Area 
In the figure below, AB is the
diameter of a circle and CD is a chord. Lines CC', DD' and BF
are perpendicular to AB. BB' is perpendicular to CD. B and B'
are the centers of arcs D'F and BE respectively. Prove that
triangles BB'E and BC'F are equal in area.
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