Equality of a Segment and an Arc in Archimedes's Spiral
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This Demonstration illustrates Proposition 20 of Archimedes's work On Spirals.[more]
Let be any point on the first turn of the spiral, and let be the intersection of the tangent to the spiral at , with the perpendicular to at . Then .[less]
Contributed by: Izidor Hafner (November 2012)
Open content licensed under CC BY-NC-SA
 T. L. Heath (ed.), The Works of Archimedes, New York: Dover Publications, 2002.
"Equality of a Segment and an Arc in Archimedes's Spiral"
Wolfram Demonstrations Project
Published: November 29 2012