Well, I will assume that you are asking what angle is 30 % of a full circle, which is equal to 360 degrees. Therefore, you need to figure out what 30% of 360 degrees is by multiplying 360 degrees times .30 (30% changed to a decimal). That answer would be 108.00. Drop the zeros and you get 108. So 108 degree angle is 30%.
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A 60 degree angle
Interior angle + Exterior angle = 180 So Interior angle = 180 - Exterior angle Interior angle = 4*Exterior angle + 30 Substitute for Interior angle: 180 - Exterior angle = 4*Exterior angle + 30 Collect like terms: 150 = 5*Exterior angle Divide by 5: Exterior angle = 30 deg Therefore number of sides = 360/30 = 12
90
The percent of increase from 30 to 39 is: 30%
11%