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What is "decagon"

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decagon
The Collaborative International Dictionary
Decagon

Decagon \Dec"a*gon\, n. [Pref. deca- + Gr. ? a corner or angle: cf. F. d['e]cagone.] (Geom.) A plane figure having ten sides and ten angles; any figure having ten angles. A regular decagon is one that has all its sides and angles equal.

Douglas Harper's Etymology Dictionary
decagon

early 17c., from Modern Latin decagonum, from Greek dekagonon, from deka "ten" (see ten) + gonia "corner, angle" (see knee (n.)).

Wiktionary
decagon

n. (context geometry English) A polygon with ten sides and ten angles.

WordNet
decagon

n. a polygon with 10 sides and 10 angles

Wikipedia
Decagon

In geometry, a decagon is a ten-sided polygon or 10-gon.

Usage examples of "decagon".

Sir Ambrose Plessington, that Proteus, that decagon with all of his mysterious side-facets, assumed yet another guise.

And, of course, that if an equilateral pentagon be inscribed in a circle, the square on the side of the pentagon is equal to the squares on the side of the hexagon and on that of the decagon inscribed in the same circle!

In the next, a true oddity, reading matter caught not in the facets of decagons but on supple wry-grass paper, lovingly handmade, bound with cor-tail thread, surrounded by covers fashioned from the speckled hides of razor-raptors, dyed hin-demuth, pebbled searay, even, astonishingly, perwillon.

Out of this fountained twenty-four small decagons, twelve each of red and black, suspended in the beam of the light, while the two contestants put their left hands into the edge of the holographic spiral.