Problem 407. Circle, Angle, Tangent, Perpendicular, Secant, Radius,
Center. Level: High School, College, SAT Prep.
Lines ABC and AD are tangent to circle
O (B, D tangency points). Line CEFG is perpendicular to AD and H
is the intersection of AF and circle O. If the measure of angle
OEC is equal to 140 degrees, find the measure of angle AHD.

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