A polygon with n sides has an average interior angle measure of 150 degrees. What is the value of n?
Recall that the formula to find the measure of one interior angle of a polygon with n sides is,
I = 180(n-2)/n
Substituting,
150 = 180(n-2)/n
150n = 180n - 360
-30n = -360
n = 12 sides
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