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Round Pond in Rectangular Garden

A round pond sits in a rectangular garden. Its center is inaccessible; however, you know the distances from each corner of the garden to the circumference of the pond: 60, 52, 28 and 40 yards. What is the radius of the pond?

The Ladies' Diary, London, 1754

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"Round Pond in Rectangular Garden," Convergence (June 2010)