The purchase price for an apple and an orange is 100 yen. When n oranges and n + 3 apples are bought the price is 520 yen. Find the number n of oranges and the price of one orange.

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There is a circle from within which a square is cut, the remaining portion having an area of 47.6255 square units.

A cultural history of the infinite, from ancient to modern times, in which the author clarifies the conceptual underpinnings of this vast topic.

A translation from the original Greek of a manuscript on magic squares by the Byzantine scholar Manuel Moschopoulos, written about 1315

This website contains a complete version of Euclid's Elements, with all the proofs.

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

A cat sitting on a wall 4 cubits high saw a rat prowling 8 cubits from the foot of the wall;

This is the title page of the French edition of Leonhard Euler's text on Algebra. The text was originally published in German in 1767 in St. Petersburg and then translated into French in 1795.

Suppose the area of an equilateral triangle be 600. The sides are required.

A biography of the geometer Donald Coxeter.