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Convergence articles

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This website is connected to the book, The Joy of Pi. It has numerous interesting facts about pi, with links to additional sites.
Prove that if the sums of the square opposite sides of any quadrilateral are equal, its diagonals interect at right angles.
A CD with eleven modules, each containing numerous activities designed to help secondary teachers use the history of mathematics to teach mathematics.
This 1989 revision of the 1969 NCTM yearbook still provides wonderful suggestions for using the history of mathematics in the classroom.

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

The history of the Poincare conjecture up to its recent proof by Grigori Perelman.
Title page from the Ars Magna, by Gerolamo Cardano, published in 1545. Engraved portrait of the author. First printed text of algebraic solution of cubic equations.
Some ideas on using student reports when you teach a course in the history of mathematics
How high above the earth must a person be raised that he [or she] may see 1/3 of its surface?
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.