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.

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