


Problem 523: Tangent Circles, Diameter Perpendicular, Collinearity. Level: High School, SAT Prep, College geometry
The figure shows circles C_{1}
and C_{2}, tangent at C. Diameter DE extended and FG are
perpendicular. If FG is tangent to C_{2},
at G. Prove that the points D, C, and G are collinear.
Post a comment or solution.



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Circle, Equilateral Triangles, Midpoint, Side, Measurement. 


Problem 522.
Right Triangle, Circle, Diameter, Tangent. 


Problem 521.
Triangle with three Squares, Altitude, Rectangle, Area. 


Problem 520.
Triangle with six Squares, Ratio, Area. 






