In the following trapezoid ABDC, if the segment lengths of AC and BD are congruent and the degree measures of
angle A = 15x + 20 and angle C = 10x - 15, what is the degree measure of angle D?

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.