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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.
In many sources, we see that Tartaglia has the surname Fontana. According to the author of this article, the co-discoverer of the cubic formula did not ever use that name.
A CD with eleven modules, each containing numerous activities designed to help secondary teachers use the history of mathematics to teach mathematics.
This is the title page of the Siderius Nuncius (Starry Messenger) of Galileo (1564-1642), published in 1610. This book was a report on Galileo's first investigations with a telescope. Also includes Galileo's initial sketches of the surface of the moon.

The "rood", a linear measure dating from many centuries ago, is calculated anew in today's classrooms.

Problems taken from Chinese sources
Three circles of varying radius are mutually tangent. The area of the triangle connecting their centers is given. Find the radius of the third circle.
How high above the earth must a person be raised that he [or she] may see 1/3 of its surface?

The copybooks of two young men reveal very different purposes in learning geometry.