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This is a page from an early printed edition of the Arithmetica of Jordanus de Nemore (early 13th century).
Given a semicircle, Prove that if O is the circle's center, DO=OE.
A man bought a number of sheep for $225; 10 of them having died, he sold 4/5 of the remainder for the same cost and received $150 for them. How many did he buy?
The radius of a circle is 3.20 meters. Compute to within .001m the areas of the inscribed and circumscribed equilateral triangles.
Two travelers, starting at the same time from the same point, travel in opposite directions round a circular railway.
What is the value of X...

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

It is required to determine whether 30 horses can be put into 7 stalls; so that in every stall there may be, either a single horse, or an odd number of horses.
A description of a Research Experience for Undergraduates conducted in 2007 at Hood College.
A translation from the original Greek of a manuscript on magic squares by the Byzantine scholar Manuel Moschopoulos, written about 1315

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