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Each interior angle of a regular 24 sided polygon is 165 degrees
If it is a regular 8 sided octagon then each interior angle is 135 degrees
Exterior angle = 360/20=18 interior angle = 180 - 18 = 162 Must be regular shape
Each interior angle of a regular 9 sided shape measures 140 degrees
Exterior angle = 14.4 degrees Interior angle = 165.6 degrees