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Formula for the interior angle of a regular polygon = [ (n - 2) x 180 ] / n
---n is the number of sides of the polygon
[ (n - 2) x 180 ] / n = 150
(n - 2) x 180 = 150n
180n - 360 = 150n
-360 = -30n
n = 12
Answer: 12 sides
Hope this helps!