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Arbelos Definition by Archimedes' Book of Lemmas

Let C be any point on the diameter AB of a semicircle. If semicircles be described within the first semicircle and having AC and CB as diameters respectively, the figure included between the circumferences of the three semicircles is "what Archimedes called arbelos".
"Arbelos" means shoemaker's knife in Greek.

Arbelos definition, semicircles, diameters

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Last updated: Mar 9, 2022