SOLUTION: interior angle of a regular polygon is 20 more than 3x the measure of its exterior angle. find the number of sides

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Question 519512: interior angle of a regular polygon is 20 more than 3x the measure of its exterior angle. find the number of sides
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
x + 3x + 20 = 180
x = 40 degs exterior angle
n = 360/40 = 9 sides