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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?

Yearning for the Impossible: The Surprising Truths of Mathematics

This book explores the history of mathematics from the perspective of the creative tension between common sense and the "impossible" as the author follows the discovery or invention of new concepts that have marked mathematical progress.

Horsing Around

One military horse cannot pull a load of 40 dan; neither can 2 ordinary horses, nor can three inferior horses...