/**
* Return the area of this cell as accurately as possible. This method is more
* expensive but it is accurate to 6 digits of precision even for leaf cells
* (whose area is approximately 1e-18).
*/
public double ExactArea()
{
var v0 = GetVertex(0);
var v1 = GetVertex(1);
var v2 = GetVertex(2);
var v3 = GetVertex(3);
return(S2.Area(v0, v1, v2) + S2.Area(v0, v2, v3));
}
