Problem

Consider the points P(1, 4, -1), Q(6, -8, 7), and R(-5, -2, -9). Let M be the midpoint of [PQ], and N be the midpoint of [QR]. a. <b>a</b> Find the coordinates of M and N. b. <b>b</b> Show that [MN] is half the length of [PR].

Browse the problem library