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Images of the first printed edition of Euclid's Elements

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 center of the pond: 60, 52, 28, and 40 yards. What is the radius of the pond?


Curve sketching, tangent lines, and optimization, explored via interactive applets

A new edition of a brief history text, arranged topically rather than chronologically.
A description of this well-regarded website.
An oracle ordered a prince to build a sacred building, whose space would be 400 cubits, the length being 6 cubits more than the width, and the width 3 cubits more than the height. Find the dimensions of the building.

Here are all articles, classroom activities, and reviews arranged into annual volumes starting with 2004.