import math

def inscribed(sides):
    
    innerangleB = 360.0/sides
    halfangleA = innerangleB/2

    onehalfsideS = math.sin(math.radians(halfangleA))

    sideS = onehalfsideS * 2

    polygonCircumference = sides * sideS
    pi = polygonCircumference/2

    return pi

def circumscribed(sides):
    innerangleB = 360.0/sides
    halfangleA = innerangleB/2

    onehalfsideS = math.tan(math.radians(halfangleA))

    sideS = onehalfsideS * 2

    polygonCircumference = sides * sideS
    pi = polygonCircumference/2

    return pi