regular hendecagon has internal angles of 147.27 degrees. The area of a regular hendecagon with side length a is given by
A regular hendecagon is not constructible with compass and straightedge; this animation shows an approximation:
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90 degrees.
Each interior angle is 150 degrees
Each interior angle measures 140 degrees
Exterior angle = 14.4 degrees Interior angle = 165.6 degrees
180*(11-2) = 180*9 = 1620 degrees.