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Problems from Another Time

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

The Door is Ajar
A two door gate of unknown width is opened so that a 2 ts'un gap exists between the two doors.
Rifle Ball Through a Three-Inch Plank
A rifle ball is fired through a three-inch plank, the resistance of which causes an unknown constant retardation of its velocity.
Two Circles
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?

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