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Convergence articles

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Wanting to know the breadth of a river, I measured a base of 500 yards in a straight line close by one side of it.
The work of ten scientists who thought deeply about patterns.
In baking a hemispherical loaf of bread of 10" radius, the crust was everywhere of an equal thickness, and the solidity of the crust was equal to half the solid content of the whole loaf. What were the dimensions of the interior soft part?
Prove that if the sums of the square opposite sides of any quadrilateral are equal, its diagonals interect at right angles.

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

A portrait gallery of mathematicians, mostly taken from the collection at the Dibner Library of the Smithsonian, with permission.
This 1989 revision of the 1969 NCTM yearbook still provides wonderful suggestions for using the history of mathematics in the classroom.
An analysis of James Gregory's proof of the Pappus-Guldin theorem, along with the original documents both in Latin and English.
A four-sided town measures 1100 feet on one side and 1000 feet on the other side, on one edge 600 and the other edge 600.
Find two numbers, x and y, such that their sum is 10 and x/y + y/x = 25

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