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Convergence articles

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Apollonius found how to draw normals to an ellipse from points in the ellipse by using hyperbolas. A modern version is presented here.
The development of 30 important mathematics subjects during the twentieth century made understandable to undergraduate mathematics majors.
A fox, a raccoon, and a hound pass through customs and together pay 111 coins.
Short biographies of mathematicians with mathematical activities.
To find three quantities x.y, and z...
A boy gives 11 coins of equal denomination to a man, and the man finds that their total value in yen is 4 less than his age.
The authors recount the 'great tale' of Napier's and Burgi's parallel development of logarithms and urge you to use it in class.
A water tub holds 73 gallons; the pipe which fills it usually admits 7 gallons in 5 minutes; and the tap discharges 20 gallons in 17 minutes.
A circle, a square and an equilateral triangle all have the same perimeter equal to 1 meter. Compare their areas.
In the figure at the left, if the radii of each inscribed circle is 1, what are the dimensions of the bounding rectangle?