surfaceArea method

double surfaceArea()

Get the surface area.

Implementation

double surfaceArea () {
	List<double> te = elements;
	double a = te[3] - te[0];
	double h = te[4] - te[1];
	double d = te[5] - te[2];
	return 2 * (a * (h + d) + h * d );
}