Problem 456: Three tangent circles, Center, Chord, Secant, Collinear
The figure shows three circles A, B,
and C tangent to each other at D, E, and F, respectively. Lines
DE and FE intersect circle A at G and H, respectively. Prove
that the points H, A, and G are collinear.
Dynamic Geometry: GeoGebra applet
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Tim Brzezinski 
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