public static decimal CalculateArea(decimal length, decimal width, decimal height, _3DBases b)
{
switch (b)
{
case _3DBases.Square:
return(Square.CalculateArea(length) + (0.5m * Square.CalculatePerimeter(length) * Right_AngledTriangle.CalculateHypotenuse(height, 0.5m * length)));
case _3DBases.Triangle:
return(EquilateralTriangle.CalculateArea(length, width) + (0.5m * EquilateralTriangle.CalculatePerimeter(width) * Right_AngledTriangle.CalculateHypotenuse(width, height)));
default:
return(123456m);
}
}