Problem 492. Cyclic Quadrilateral, Circle, Perpendicular, Parallel.
Level: High School, College, SAT Prep.
The figure shows a cyclic
quadrilateral ABCD and a circle O. AEF is perpendicular to AC (E
on the circle O and F on DB extended), DGH is perpendicular to
BD (G on the circle O and H on AC extended), Prove that FH, BC,
and EG are parallel.
How to Solve It, Mind Map
George Pólya's 1945 book "How to Solve It, A new
aspect of Mathematical Method", is a book
describing methods of problem solving. It
suggests the following steps when solving a
mathematical problem: (1) First, you have to
understand the problem. (2) After understanding,
then make a plan. (3) Carry out the plan. (4)
Look back on your work. How could it be better?

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