The three-dimensional (X, Y, Z) coordinates in feet for vertices A, B, and C in Figure 18.14 are (8649.22, 6703.67, 143.86), (8762.04, 6649.77, 165.88), and (8752.64, 6770.20, 146.84), respectively. What are the coordinates of the intersections of the 150-ft contour as it passes through the sides of the triangle?