# 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.*