decagon
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Most of the list came from the state eighth grade curriculum: barometer, decagon, perpendicular .
From "Schooled" by Gordon Korman
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The first known was Cylinder A, a decagon, whose lines divide the document into thirteen parts.
From Assyrian Historiography by Olmstead, A. T. (Albert Ten Eyck)
The solution is required later on in the construction of a regular decagon.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various
The purpose of this problem is to prepare for the construction of the regular decagon and pentagon.
From The Teaching of Geometry by Smith, David Eugene
The plan of the church was a decagon, within which six composite columns in the centre supported six semi-circular vaults.
From Old and New London Volume I by Thornbury, Walter
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 Brown, Goold
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 Wilderspin, Samuel