geometry

what is the formula for the area of a regular polygon?

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  1. A =(1/4) n a^2 ctn (180/n)
    A is area
    a is length of side
    n is number of sides
    ctn is cotangent

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  2. if the angle of a regular polygon is 20 degrees how many sides does the ploygon have? 18 sides, but show your work

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