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A guest on horseback rides 300 li in a day. The guest leaves his clothes behind and the host rides off to catch up with the guest once he discovers the clothes. Assuming the host rides without stop tell how far he can go in a day?

Triangles in the Sky: Trigonometry and Early Theories of Planetary Motion

A survey of early theories of planetary motion, with dynamic figures to help in understanding these motions.

Sides of a Rectangle

Given a rectangle, find the line through one vertex of minimum length that passes through the extensions of the two opposite sides.

Equal Surface and Volume

What will the diameter of a sphere be, when its volume and surface area are expressed by the same number?

The Great Calculation According to the Indians, of Maximus Planudes

A translation of part of a thirteenth century work by the Byzantine monk Maximus Planudes on the Hindu-Arabic numerals and the algorithms for calculation.

Weight of a Ball

If a ball 6 inches in diameter weighs 32 lbs, what will be the weight of a ball 3 inches in diameter?

Who's That Mathematician? Images from the Paul R. Halmos Photograph Collection

Paul Halmos Photograph Collection, page 3: M. Auslander, R. Baer, Banchoff, C. N. Moore, I. A. Barnett, P. Erdos, and Lida Barrett

The Calculus Gallery

A gallery of episodes from the history of calculus.

Simon Jacob's Rechenbuch

This is the title page of the 1599 edition of the Rechenbuch of Simon Jacob (d. 1564), a Rechenmeister of the sixteenth century. This was a commercial arithmetic text, in which the basic laws of arithmetic were applied to many practical problems.

Area Approximation

Fibonacci gave a practical rule for approximating the area of an equilateral triangle.