# Constructing the Radius of a Ball

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Using a ball, a sheet of paper, a compass, a straightedge without markings, and a pencil, can you draw a line segment on the paper equal to the ball's radius?

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Contributed by: Izidor Hafner (June 2014)

Open content licensed under CC BY-NC-SA

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Reference

[1] B. A. Kordemsky, *The Moscow Puzzles*, London: Penguin, 1990 pp. 251–252.

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