Assuming regular figure:
Exterior angle = 360/11 = 32.73 degrees so interior angle = 180 - 32.73 which is 147.27 degrees
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Each interior angle measures 144 degrees
Providing that it's a regular 54-gon then each interior angle measures 173 and a 1/3 degrees
A Pentagon has an interior angle of 108 degrees.
Any polygon can have an interior angle of 144 degrees. The measurement of an interior angle of a decagon is 144 degrees.
It is: 180-interior angle = exterior angle