Verified Answer :

Sum of exterior angles of any polygon is 360 degrees. 
Each exterior angle of a regular polygon = 360/n where n is the number of sides. 
So, n = 360/20 = 18. Your answer is D


Hope this helps.

apologiabiology

the sum of the extrior angles always adds to 360
each exterior angle has to have a side to go with it

so
360/20=18 sides

answer is D

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