Triangle ABC has vertices A(-1,3), B(1, -1), and C(5,2). Find the length of the line segment from A to the midpoint of [BC].

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.