If ad = 6 cm, db = 4.2 cm, ab = 8.7 cm, and ed = 3.9 cm, what is the measure of dc?

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.