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Convergence articles

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A tree is 20 feet tall and has a circumference of 3 feet. There is a vine that winds seven equally spaced times around the tree and reaches the top. What is the length of the vine?
In order to encourage his son in the study of arithmetic, a father agrees to pay him 8 pennies for every problem solved correctly and to charge him 5 pennies for each incorrect solution.
What will the diameter of a sphere be, when its volume and surface area are expressed by the same number?
Request from the editors.
A brief introduction to the life of John Napier, along with an animation of calculations using Napier's bones.
A number of 3 digits in base 7 has the same three digits...
A delightful survey of the history of trigonometry, along with discussions of its uses, both ancient and modern.
An extension of Al-Karaji's formula for the sum of the cubes by a 19th century Turkish author and journal editor
Given: a circle with an inscribed equilateral triangle. The triangle has an area of 12 square units. What is the area of the circle?
The earliest known example of a printed book on arithmetic, dates to 1478. Also known as the Art of Calculation.

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