Problem 355. Circles, Common external tangent, Concyclic points.
Level: High School, College, SAT Prep.
The figure shows circles 1 and 2 with
the common external tangents EH and AD. BF is tangent to circle 1
at M, CG is tangent to circle 2 at N. Lines AM and DN
meet at P and lines EM and HN meet at Q. Prove that the points
M, P, N, and Q are concyclic (lie on a same circle).

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