The figure below shows circles O and
Q intersecting at A and B. Chord CA is tangent to circle Q at A,
chord DA is tangent to circle O at A. Diameter EF is parallel to
AC and diameter GH is parallel to AD. Prove that points E, F, H,
and G are concyclic.
![Geometry Problem 951: 1: Intersecting Circles, Chord, Diameter, Parallel, Cyclic Quadrilateral, Concyclic Points](p951-intersecting-circles-tangent-diameter-parallel-cyclic-quadrilateral.gif)
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