360/11 ie just under 33 degrees
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If it's regular then 360/20 = 18 degrees
Exterior angle = 14.4 degrees Interior angle = 165.6 degrees
Exterior angle = 360/20=18 interior angle = 180 - 18 = 162 Must be regular shape
A nine sided shape that is called a regular nonagon.
360/number of sides = exterior angle