, is a polygon of eleven sides.
If the side of a regular Undecagon be 1, its area will be 9.3656399 = 11/4 X tang. of 73 7/11 degrees; and therefore if this number be multiplied by the square of the side of any other regular Undecagon, the product will be the area of that Undecagon. See my Mensuration, pa. 114 &c, 2d edit.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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