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The figure shows a triangle ABC with the
orthocenter D (point where altitudes intersect). Circles 1, 2 (center
E), 3 (center F), 4 (center G), and 5 are the circumcircles of triangles
ABC, ADB, BDC, ADC, and EFG, respectively. Circle 6 is tangent to
circles 2, 3, and 4 at points H, M, and N, respectively. Prove that:
(1) Circles 1,2,3,4,5 are congruent. (2) D is the center of circle 5.
(3) D is the center of circle 6. (4) Points H,B,M are collinear, H,A,N
are collinear, and M,C,N are collinear. (5) Points D,E,H are collinear,
D,F,M are collinear, and D,G,N are collinear.
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