Wednesday
April 16, 2014

Homework Help: geometry

Posted by flex on Tuesday, April 30, 2013 at 9:18am.

Outside of circle Γ, point A is chosen. Tangents AB and AC to Γ are drawn, with B,C on the circumference of Γ. On the extension of AB, D is a point such that B is between A and D, and ∠ADC=25∘. The circumcircle of ADC intersects Γ again at E (different from point C ). F is the foot of the perpendicular from B to DC. What is the measure (in degrees) of ∠DEF?

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