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Problem 296: Intersecting Circles, Chord, Radius, Angle, Perpendicular.
Level: High School, College, SAT Prep.

In the figure, the circles O and Q intersect at A and B. C is a point on circle O. Lines AC and BC meet circle Q at points D and E, respectively. Prove that lines OC and DE are perpendicular.  See also: Geometric art Mobile Apps.


Circles, Chord, Radius, Perpendicular

Geometry problem solving is one of the most challenging skills for students to learn. When a problem requires auxiliary construction, the difficulty of the problem increases drastically, perhaps because deciding which construction to make is an ill-structured problem. By “construction,” we mean adding geometric figures (points, lines, planes) to a problem figure that wasn’t mentioned as "given."

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