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Given: a circle with an inscribed equilateral triangle. The triangle has an area of 12 square units. What is the area of the circle?
Gun metal of a certain grade is composed of 16% tin and 84% copper. How much tin must be added to 410 lbs. of this gun metal to make a composition of 18% tin?
Reprint of a classic biography of Gauss, with a new forward by Jeremy Gray.
This is the title page of the 1640 printing of Galileo's Operation of the Geometrical and Military Compass, originally published privately in 1606. Galileo had invented a version of this geometrical compass a few years earlier and evidently gave copies of this manual to those who bought the compass. The compass had many uses, from performing square root calculations to determining ranges of cannons to solving surveying problems.
Find two numbers such that multiplying one by the other makes 8 and the sum of their squares is 27.

The history and mathematics of curve sketching, tangent lines, and optimization, are explored using interactive applets.

Eratosthenes' measurement of the earth, in a form that's easy for teachers to use in the classroom.
A description of this well-regarded website.
This website is connected to the book, The Joy of Pi. It has numerous interesting facts about pi, with links to additional sites.