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Convergence articles

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The triangle ABC has a right angle at C. Show that 1/ED=1/AC+1/AB
A lady has two silver cups, and only one cover for both. The first cup weighs 16 oz, and when it is covered it weighs 3 times as much as the second cup; but when the second cup is covered, it weighs 4 times as much as the first.
A tree is 20 feet tall and has a circumference of 3 feet. There is a vine that winds seven equally spaced times around the tree and reaches the top. What is the length of the vine?
An English translation of Eratosthenes' Geography, which includes "On the Measurement of the Earth."
A collection of articles on using the history of mathematics of the past 200 years in the undergraduate classroom.
The history of apportionment of representatives in the U.S. Congress, from the 1790s until today, along with a discussion of the mathematics involved in the various methods.
The work of ten scientists who thought deeply about patterns.
A portrait gallery of mathematicians, mostly taken from the collection at the Dibner Library of the Smithsonian, with permission.
A number of 3 digits in base 7 has the same three digits...
A gentleman has bought a rectangular piece of land whose perimeter is to be 100 rods; and he is to pay 1 dollar for each rod in the length of the land and 3 dollars for each rod in the breath of the land.