The interior angles of an 18 sided polygon add up to 2880 degrees
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Exterior angle = 360/20=18 interior angle = 180 - 18 = 162 Must be regular shape
Each interior angle measures 160 degrees
Providing that it's a regular polygon each interior angle is: 1520 18' 27.69''
It wil be a regular 18 sided polgon
If it's regular then 360/20 = 18 degrees