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Convergence articles

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A collection of short biographical sketches of people involved in the development of calculus, as well as brief descriptions of important events in that development.
If a ladder, placed 8 ft. from the base of a building 40 ft. high, just reached the top, how far must it be placed from the base of the building that it may reach a point 10 ft. from the top?
Two circles of radii 25 feet intersect so that the distance between their centers is 30 feet. What is the length of the side of the largest square inscribable within their intersecting arcs?

[Translation of title: Algebra in the Time of Babylon. When Mathematics Were Written on Clay.] A thorough review of Jens Hoyrup's revision, expansion, and French translation of his own 1998 book for Danish high-school students.

Arithmos seminars are 24-hour workshops on the classics of mathematics, read in the original, or in a scholarly English translation.
The Tree of Proportions and Proportionality from the De Divina Proportione of Luca Pacioli published in 1509.
There is a round fish pond of certain dimensions, and into the pond is dropped a marble column. How high will the water rise?
The sum of the two digits of a 2-digit number is 9. If 45 is subtracted from the number, the result will be expressed by the digits in reverse order. Find the number.
In a right triangle, let the perpendicular be 5 and the sum of the base and hypotenuse 25. Find the lengths of the base and hypotenuse
A certain man says that he can weigh any amount from 1 to 40 pounds using only 4 weights. What size must they be?