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Convergence articles

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The triangle ABC has a right angle at C. Show that 1/ED=1/AC+1/AB
The classic work by Dirk Struik is still worth reading, especially for its attention to the social context of the development of mathematical ideas.
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?
What is the perpendicular height of a cloud when its angles of elevation were 35 degrees and 64 degrees as taken by two observers at the same time...
An introduction to the priority dispute between Euler and D'Alembert relating to several mathematical ideas that both worked on in the 1740s and 1750s.
This is the page illustrating the construction of an ellipse, from the Latin translation (1538) of the Treatise on Mensuration of Albrecht D�rer (1471-1528). This book was originally written in German and published in 1525 and was designed to teach German artists the geometrical ideas on which perspective in painting was based.
Apollonius found how to draw normals to an ellipse from points in the ellipse by using hyperbolas. A modern version is presented here.
A number of 3 digits in base 7 has the same three digits...
A fox, a raccoon, and a hound pass through customs and together pay 111 coins.