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 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
This side being known the decagon can be constructed, and if the vertices are joined alternately, leaving out half their number, we obtain the regular pentagon.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various
But the children wanted to know all the names, taking pleasure in learning even 54 the most difficult, such as trapezium, and decagon.
From Dr. Montessori's Own Handbook by Maria Montessori
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 Walter Thornbury
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
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
