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Convergence articles

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Now there is a wall 5 feet thick and two rats tunnel from opposite sides.
Given: a circle with an inscribed equilateral triangle. The triangle has an area of 12 square units. What is the area of the circle?
Two officers each have a company of men, the one has 40 less than the other.
Images from a 16th century text about the astrolabe and its uses
An old Chinese general led his army to a river with a steep bank. Standing atop the bank, he held a stick 6 feet long perpendicular to himself.
A new sourcebook containing the works in their original form along with a translation and a brief commentary.
There are two numbers whose sum equals the difference of their squares.
A biography of Arthur Cayley, the outstanding mathematician of Victorian Britain.
Given a guest on horseback rides 300 li in a day. The guest leaves his clothes behind. The host discovers them after 1/3 day, and he starts out with the clothes.
One military horse cannot pull a load of 40 dan; neither can 2 ordinary horses, nor can three inferior horses.