xd = x2-x1 yd = y2-y1 Distance = SquareRoot(xd*xd + yd*yd)re>
xd = x2-x1 yd = y2-y1 zd = z2-z1 Distance = SquareRoot(xd*xd + yd*yd + zd*zd)pre>
Session-Cookies