GEOMETRY(POLYGON)
posted by please help me out!! .
A regular polygon has interior angles of 150∘. A,B,C,D are 4 consecutive points of this polygon. What is the measure (in degrees) of ∠ADC?

GEOMETRY(POLYGON) 
Steve
150n = 180(n2)
n = 12
So, the figure is a 12gon
That should get you started
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