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A circle is inscribed in an isosceles trapezoid. Find the relationship of the radius to the sides.

A comprehensive history of trigonometry from ancient times to the Renaissance.

How long does it take a single man to do work when...

The quadrennial meeting of the International Study Group on the Relations between History and Pedagogy of Mathematics will be in Mexico City, July 14-18, 2008.

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.

There is a log 18 feet long, the diameter of the extremities being 1 ft and 2.6 ft respectively...

In a square box that contains 1000 marbles, how many will it take to reach across the bottom of the box in a straight row?

A fellow said that when he counted his nuts by twos, threes, fours, fives and sixes, there was still one left over; but when he counted them by sevens they came out even. What is the smallest number of nuts he could have?

Subtitled How an Ancient Brotherhood Cracked the Code of the Universe and Lit the Path from Antiquity to Outer Space, this is a book of entertaining stories more so than scholarly research.

Given the dimensions of an isosceles trapezoid, find the length of the transversal drawn parallel to the bases that divides the trapezoid into 2 equal areas.