decagon
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Most of the list came from the state eighth grade curriculum: barometer, decagon, perpendicular .
From "Schooled" by Gordon Korman
The purpose of this problem is to prepare for the construction of the regular decagon and pentagon.
From The Teaching of Geometry by David Eugene Smith
The first known was Cylinder A, a decagon, whose lines divide the document into thirteen parts.
From Assyrian Historiography by A. T. (Albert Ten Eyck) Olmstead
To construct a regular pentagon, we find it convenient first to construct a regular decagon.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various
This, however, does not change the real nature of his solution, nor does his solution become simpler by not mentioning the decagon.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various
Of nouns in on, derived from Greek, the greater part always form the plural regularly; as, etymons, gnomons, ichneumons, myrmidons, phlegmons, trigons, tetragons, pentagons, hexagons, heptagons, octagons, enneagons, decagons, hendecagons, dodecagons, polygons.
From The Grammar of English Grammars by Goold Brown
A. Because it has ten sides and ten angles, and there are both regular and irregular decagons.
From The Infant System For Developing the Intellectual and Moral Powers of all Children, from One to Seven years of Age by Samuel Wilderspin
