Step-by-step explanation:
Radius of a cicke is calculated by 2 pi r 
Equation is found by y=mx+C 
 
        
             
        
        
        
Answer:
Never
Step-by-step explanation:
Using the formula to find the sum of the interior angles, (n-2) * 180, we can work backwards. 
300/180 +2 = 11/3 or 3.666. Polygons cannot have decimal sides therefore your answer is never.