20. The distance d from a point P (xp, yp, 2p) to the line that passes through the two points A (xy) and B (x, y, z) can be calculated by d=28/r where r is the distance between the B, given points A and by r = (x-x)+(y)+(2-2) and S is the area of the triangle defined by the three points cal- culated by 5=++, where XpY+X+XYp - (ypq+Y+YyXp) $ = p + y+ yp -(pya+za+Zap) b 3=XpZ+X+xq2p - (px +2x+2x). Determine the distance of point F(2,6 -1) from the line that passes through point 4(-2, -1.5.-3) and point B(-2.5, 6,4). First define the variables x, yn n XA YA ZA , Y and Z and then use the variable to calculate 51, 52, 53, and r. Finally cal- culate S and d.