find the area of a trapezoid in csharp

main.cs
area = (b1 + b2) * h / 2;
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main.cs
public static double CalculateTrapezoidArea(double b1, double b2, double h)
{
    double area = (b1 + b2) * h / 2;
    return area;
}
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main.cs
double b1 = 5.0;
double b2 = 7.0;
double h = 4.0;
double area = CalculateTrapezoidArea(b1, b2, h);
Console.WriteLine("Area of trapezoid with bases {0} and {1} and height {2} is {3}", b1, b2, h, area);
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main.cs
Area of trapezoid with bases 5 and 7 and height 4 is 24
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