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Convergence articles

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A horse halving its speed every day runs 700 miles in 7 days.
How high above the earth must a person be raised that he [or she] may see 1/3 of its surface?
An image of the calendar, together with instructions for its use
Prove that the area of a regular polygon can be given by the product of its perimeter and half the radius of the inscribed circle.
This is the title page to the 1811 edition of the Descriptive Geometry of Gaspard Monge (1746-1818). This book deals with methods for representing three-dimensional objects in two dimensions. It was written to accompany Monge's courses at the Ecole Polytechnique in Paris.
Three men wish to buy a horse but none have a sufficient amount of money for the purchase; to do so they must borrow from each other. How much money does each man have and what is the price of the horse?
A thorough study of Benjamin Franklin's mathematical accomplishments, in particular his work on magic squares.
As for a square piece of land that amounts to 100 square cubits, if it is said to you, "Cause it to make a piece of land that amounts to 100 square cubits that is round," what is the required diameter?
Now there are six-headed four-legged animals and four-headed two-legged birds placed together.
Having been given the sum of two numbers,a, and the difference of their squares,b, find the numbers.

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