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A square walled city measures 10 li on each side. At the center of each side is a gate. Two persons start walking from the center of the city.
Given a right triangle where you know the length of the base and the sum of the perpendicular side and the hypotenuse.

Three circles of varying radius are mutually tangent. The area of the triangle connecting their centers is given. Find the radius of the third circle.
Two circles, the sum of whose radii is a, are placed in the same plane with their centers at a distance 2a...
A survey of concepts of infinite sets over the centuries.
There is a round town 8000 feet in circumference.

We invite you to send us information about these photographs of 20th century mathematicians.

Assume that the human population after the flood was 6 and that 200 years later the population was 1,000,000. Find the annual growth of the population.
On Triangles, by Regiomontanus (Johannes M�ller) (1436-1476), written in 1464 but not published until 1533.
One hundred men besieged in a castle, have sufficient food to allow each one bread to the weight of 14 lot a day for ten months.

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