The triangle ABC has a right angle at C. Show that 1/ED=1/AC+1/AB

Individual problems from throughout mathematics history, as well as articles that include problem sets for students.

The triangle ABC has a right angle at C. Show that 1/ED=1/AC+1/AB

How a translation of Peano's counterexample to the 'theorem' that a zero Wronskian implies linear dependence can help your differential equations students

Given the frustum of a circular cone with height h.

A man went to a draper and bought a length of cloth 35 braccia long to make a suit of clothes.

Two circles, the sum of whose radii is a, are placed in the same plane with their centers at a distance 2a...

Three congruent circles of radius 6 inches are mutually tangent to one another. Compute the area enclosed between them.

Discussion of 15th century French manuscript, with translation of its problems, including one with negative solutions

An official asks a woman why she has so many bowls to wash. The woman explains that she had dinner guests who ate meat, rice, and soup. Judging by the number of bowls, how many guests were there?

Determine the radii of three equal circles decribed within and tangent to a given circle, and also tangent to each other

The radius of a circle is 3.20 meters. Compute to within .001m the areas of the inscribed and circumscribed equilateral triangles.