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The size of each interior angle of a regular polygon is five times the size of the exterior angle. Find the number of sides of the polygon.

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Exterior < = 360
                     n
Interior < = 180 - 360
                             n
180 – 360 = 5 ( 360/n )             
           n
180n – 360 = 1800
            n          n              
180n = 2160
      n = 12            

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