An electrical power transmission line runs between points A, B, and C, as shown, and a n...

An electrical power transmission line runs between points A, B, and C, as shown, and a new power transmission line between points B and D is to be constructed. The coordinates of points A, C, and D are A(6000, 1000, 500) ft, C(700, 4500, 900) ft, and D(2000, 400, 1400) ft. Use the tip given in the margin note on p. 211 to determine the smallest length possible for the new power line. Assume that power lines ABC and BD are straight.