Joel is planting a garden in the shape of a trapezoid. Three of the sides are the same length, and the fourth side is 18 feet long. He uses 58.5 feet of fencing to surround the garden. What is the maximum length of each of the other three sides? HELP PLS

Joel is planting a garden in the shape of a trapezoid Three of the sides are the same length and the fourth side is 18 feet long He uses 585 feet of fencing to class=