Arbelos

The type of shoemaker's knife that gave its name to the figure

Arbelos skulpture in Kaatsheuvel, Netherlands

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.

单词	Arbelos
释义	Arbelos 英语百科 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.
随便看	teleiconograph teleiconographs teleidoscope tele indicating system teleindication teleindicator teleinformatic teleinformatics teleinformatic service teleinformatic services teleinstruction teleinstructional teleinstructor teleinstructors teleintervention teleinterventions teleiochrysalis teleiophane teleiophan stage Teleiophile teleiophiles Teleiophilia teleiosis teleiotic tele irradiation