Maude's living room is in the shape of a rectangle. its dimensions are 21 feet by 14 feet. find the length of the diagonal of the living room. round your answer to the nearest tenth if necessary.

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.