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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.
Show that the curves x2 - y2 = a2 and 2 xy = b2 cross at right angles.
Why should we use historical problems in today's classroom? This article answers that question and serves as an introduction to the problems on this website.
A CD with eleven modules, each containing numerous activities designed to help secondary teachers use the history of mathematics to teach mathematics.
A collection of articles about historical and contemporary women in mathematics.
Short sketches on how mathematicians work and think.
A collection of short lectures by Howard Eves giving details on 20 important happenings in the history of mathematics before 1650.

Three images from Kepler's 1609 Astronomia Nova, the text in which he introduced his first two laws of planetary motion

Find the area of the elliptical segment cut off parallel to the shorter axis;
In the middle of the 18th century, King Frederick the Great of Prussia became interested in creating a lottery to raise money. As was his custom when mathematical matters were involved, he called upon Leonhard Euler for counsel.

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