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

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

A collection of articles in the history of mathematics that appeared in journals of the Mathematical Association of America over the past 90 years.

Essays on how number has been critical to the work of scientists through the ages.

Three images from Kepler's 1609 Astronomia Nova, the text in which he introduced his first two laws of planetary motion

The classic work by Dirk Struik is still worth reading, especially for its attention to the social context of the development of mathematical ideas.

Determine the dimensions of the least isosceles triangle ACD that can circumscribe a given circle.

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 superb collection of articles by experts on various areas of the history of analysis, from the Greeks to modern times.

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. How many did he have?

Where does pi come from? Why should we be interested in negative numbers, or square roots of negative numbers? How did people ever figure out the quadratic formula? A truly wonderful reference for teachers at all levels.