H = X2-X1 HH = H^2 I = 4*HH J = H*I t0 = Y2-Y1 r = 2*t0 V = X1*I t1 = r^2 t2 = 2*V t3 = t1-J X3 = t3-t2 t4 = V-X3 t5 = Y1*J t6 = 2*t5 t7 = r*t4 Y3 = t7-t6 Z3 = 2*H