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This is from a letter of June, 1695 in which Leibniz is discussing differentiation with Johann Bernoulli. The work in which these letters appear is the Virorum Celeberr. Got. Gul. Leibnitii et Johann Bernoulli Commercium Philosophicum et Mathematica, originally published in 1740.
Prove that the area of a regular polygon can be given by the product of its perimeter and half the radius of the inscribed circle.
Whimsical posters of fifteen mathematicians with brief biographies.
Guidelines for Submissions
Find two numbers such that multiplying one by the other makes 8 and the sum of their squares is 27.
Having been given the perimeter and perpendicular of a right angled triangle, it is required to find the triangle.
This work discusses the people who solved some of Hilbert's problems from 1900, as well as the mathematics involved in the solutions.

The author shows how teachers can use Leonhard Euler's original works in the classroom to explore Euler's famous polyhedral formula,
V + F = E + 2.

The incircle O(r) of triangle ABC touches AB at D, BC at E and AC at F. Find r in terms of AD, BE and CF.

Historical Problems can be used to enliven any mathematics class. Here are some examples from medieval times, from a 19th century American textbook, and from a 19th century Armenian textbook, among other sources.

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