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Wanting to know the breadth of a river, I measured a base of 500 yards in a straight line close by one side of it.
History of Maya calendars, including the modified base 20 number system used in them
In baking a hemispherical loaf of bread of 10" radius, the crust was everywhere of an equal thickness, and the solidity of the crust was equal to half the solid content of the whole loaf. What were the dimensions of the interior soft part?
This is from a letter of June, 1695 in which Leibniz is discussing differentiation with Johann Bernoulli. The work in which these letters appear is the Virorum Celeberr. Got. Gul. Leibnitii et Johann Bernoulli Commercium Philosophicum et Mathematica, originally published in 1740.
Make of 10 three parts such that one part multiplied by 3 makes as much as the other multiplied by 4 and as the other multiplied by 5.
This is a collection of plates that Leonardo da Vinci created to illustrate De divina proportione of Luca Pacioli.
Given a number, take 1/3 of the number away from itself and add 2. If this result is multiplied by itself, it equals the number plus 24. What is the number?
Now there are three sisters who leave home together.
A four-sided town measures 1100 feet on one side and 1000 feet on the other side, on one edge 600 and the other edge 600.
What is the sum of the following series, carried to infinity: 11, 11/7, 11/49, etc.?