A kite frame is to be made from six pieces of wood. The four pieces that form its border have been cut to the lengths indicated in the figure (r = 6,...

A kite frame is to be made from six pieces of wood. The four pieces that form its border have been cut to the lengths indicated in the figure (r = 6, k = 11). Let x be as shown in the figure. a)Find the function that gives the area of the kite. b)How long should each of the two crosspieces be to maximize the area of the kite? (Give your answers correct to 2 decimal places.) (horizontal crosspiece)(vertical crosspiece)