AMC 10 Step by Step
2011 AMC 10AProblem 20P16-20~5 minPrint

Two points on the circumference of a circle of radius rr are selected independently and at random. From each point a chord of length rr is drawn in a clockwise direction. What is the probability that the two chords intersect?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.