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Problem 493. Right Triangle, Circumcircle, Perpendicular, Chord.
Level: High School, College, SAT Prep.

The figure shows a right triangle ABC (angle B = 90 degrees) with the circumcircle C1 and center O. From point D on C1, perpendiculars DE and DF are drawn to AC and AB, respectively. Lines BD and EF intersect at G. Prove that OG is perpendicular to BD.
Circumcircle of a triangle is the circle which passes through the vertices.

Right triangle, circumcircle, Perpendicular


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? 

Mind Map: How to Solve It


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