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Convergence articles

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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.
There are two piles, one containing 9 gold coins, the other 11 silver coins.
Image of first arithmetic book published in the English colonies in what is now the Eastern United States
A collection of illustrations of Inca quipus, with references to their earliest descriptions.
Given two circle tangent at the point P with parallel diameters AB, CD, prove that APD and BPC are straight lines.
Having been given the perimeter and perpendicular of a right angled triangle, it is required to find the triangle.
A number is required; that the square shall be equal to twice the cube.
Make a crown of gold copper, tin, and iron weighing 60 minae: gold and copper shall be 2/3 of it; gold and tin, 3/4 of it; and gold and iron, 3/5 of it. Find the required weights of gold, copper, tin, and iron.
The incircle O(r) of triangle ABC touches AB at D, BC at E and AC at F. Find r in terms of AD, BE and CF.

A five-volume set of biographies of mathematicians from ancient times to the twentieth century, aimed at secondary students.