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GEOMETRY(POLYGON)

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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) - ,

    150n = 180(n-2)
    n = 12

    So, the figure is a 12-gon
    That should get you started

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