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Convergence articles

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In a given square, inscribe 4 equal circles so that...
A letter to Sam Greitzer, late editor of Arbelos, discussing the derivation of two formulas for calculating pi.
This is the title page of the geometry book of Jacob Kobel (1460 - 1533). The book dealt primarily with measurement, showing its readers how to use various instruments to measure fields, determine heights of buildings, and perform various other necessary tasks.
Find the isoceles triangle of smallest area that circumscribes a circle of radius 1.
A great book from which to learn and teach the subject of relativity.
A man is walking across a bridge, when a boat passes under the bridge.How rapidly are the boat and the pedestrian separating after the boat passes under the bridge?
A certain bishop ordered that 12 loaves be divided among his clergy.
History of Maya calendars, including the modified base 20 number system used in them
What is the sum of the reciprocals of the triangular numbers?
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.