Question

How to calculate the area of a pentagon in C#

Answer 1

using System;

class Program
{
    static float PentagonArea(float side, float apothem) {
        return 5.0f * (side * apothem) / 2.0f;
    }

    static void Main()
    {
        float side = 5.0f;
        float apothem = 3.0f;

        float area = PentagonArea(side, apothem);

        Console.WriteLine($"Area = {area:F2}");
    }
}



/*
run:

Area = 37.50

*/

 

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Answer 2

using System;

class Program
{
    static double AreaRegularPentagon(double side) {
        return (1.0 / 4.0) * Math.Sqrt(5.0 * (5.0 + 2.0 * Math.Sqrt(5.0))) * Math.Pow(side, 2);
    }

    static void Main()
    {
        Console.WriteLine(AreaRegularPentagon(7.0));
    }
}


/*
run:

84.3033926288594

*/

 

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