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Problems from Another Time

Individual problems from throughout mathematics history, as well as articles that include problem sets for students.

A man went to a draper and bought a length of cloth 35 braccia long to make a suit of clothes.
In a circle whose circumference is 60 units, a chord is drawn forming a segment whose sagitta is 2 units. What is the length of the chord?
Two circles, the sum of whose radii is a, are placed in the same plane with their centers at a distance 2a...
Three congruent circles of radius 6 inches are mutually tangent to one another. Compute the area enclosed between them.
Find two numbers, x and y, such that their sum is 10 and x/y + y/x = 25
Determine the dimensions for a right-angled triangle, having been given the hypotenuse, and the side of the inscribed square.
What is the sum of the reciprocals of the triangular numbers?
Three equal circumferences with radii 6" are tangent to each other. Compute the area enclosed between them.
Suppose the area of an equilateral triangle be 600. The sides are required.
A boy gives 11 coins of equal denomination to a man, and the man finds that their total value in yen is 4 less than his age.