Oh, dude, a hendecagon has 11 sides, so it's got 11 interior angles. It's like simple math, you know? Each interior angle in a hendecagon measures 147.27 degrees, but who's really counting, right? Math is fun... or something.
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Every polygon has the same number of angles as it has sides.
In the case of the hendecagon, that's eleven.
Hendecagon or undecagon
regular hendecagon has internal angles of 147.27 degrees. The area of a regular hendecagon with side length a is given byA regular hendecagon is not constructible with compass and straightedge; this animation shows an approximation:
A shape with 11 sides and angles is called an 11-gon, or a hendecagon.
Heptagon, octagon, nonagon, decagon, hendecagon, and dodecagon. There are many more.
Anything from none, 2 to 11 sides; and none, 2 to 11 angles. And, the number of equal sides may or may not be the same as the number of equal angles.