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arbelos
In geometry, an arbelos is a plane region bounded by three semicircles connected at the corners, all on the same side of a straight line (the ''baseline'') that contains their diameters.〔
The earliest known reference to this figure is in the ''Book of Lemmas'' by Archimedes, where some of its mathematical properties are stated as Propositions 4 through 8.〔
==Etymology==
The name ''arbelos'', used by Archimedes, comes from Greek ἡ ἄρβηλος ''he árbēlos'' or ἄρβυλος ''árbylos'', meaning "shoemaker's knife", a knife used by cobblers from antiquity to the current day, whose blade is said to resemble the geometric figure.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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