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5 votes
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How to draw Archimedean-Galileo spiral?

It is known that some plane curves can be drawn with a tool. For instance, I heard at a web site that Archimedes created his spiral in the third century B.C. by fooling around with a compass and other …
Mikhail Gaichenkov's user avatar
2 votes
0 answers
164 views

Geometric construction of real root of quintic using marked ruler and compass

My question is motivated by a geometry problem about special folded rectangle: 'A rectangle with sides a, b (a<b) is folded along the line that passes through the center of the rectangle in order to g …
Mikhail Gaichenkov's user avatar