/// <summary>
/// 1/3 (Base x Height)
/// </summary>
/// <returns></returns>
public virtual Volume CalculateConicalVolume()
{
if (!Height.IsSpecified || !Girth.IsSpecified)
{
return(Volume.Null());
}
double radius = (double)Girth.Feet / Math.PI / 2.0;
return(Volume.CalculateConical(radius, Height.Feet));
}