Problem 297: Intersecting Circles, Chord, Secant, Radius, Angle,
Perpendicular. Level: High School, College, SAT Prep.
In the figure, the circles O and Q intersect at A and B. Q is a point
on circle O and C is a point on
circle Q. Lines AC and BC meet circle O at points E and D, respectively. Prove that
lines QC and DE are perpendicular.

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