def area(n, side):
    n = eval(input("Enter the number of sides: "))  # 多边形的边数
    side = eval(input("Enter the side: "))  # 多边形的长度
    area_num = (n * pow(side, 2)) / (4 * math.tan(math.pi / n))
    print("The area of the pentagon is {:>.20f}".format(area_num))


area(1, 2)

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