(thing) by jesler Sun Jun 24 2001 at 13:07:14
<< Decagon   -   Dodecagon >>

A polygon of eleven sides, havng an internal angle sum of 1620 degrees.

For a regular undecagon with sides of length x,

Area = x29.366
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(definition) by Webster 1913 Wed Dec 22 1999 at 4:04:41

Un*dec"a*gon (?), n. [L. undecim eleven + Gr. an angle.] Geom.

A figure having eleven angles and eleven sides.

 

© Webster 1913.

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