ENDECAGON

, a plane geometrical figure of eleven sides and angles, otherwise called Undecagon. If each side of this figure be 1, its area will be 9.3656399 = 11/4 of the tang. of 73 7/11 degrees, to the radius 1. See my Mensuration, pa. 114, &c, 2d edit. See also Regular Figure.

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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.

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EMBOLUS
EMBRASURE
EMERSION
EMERSON (William)
ENCEINTE
* ENDECAGON
ENFILADE
ENGINE
ENGINEER
ENGONASIS
ENGYSCOPE