The area of ANY rectangle (including squares) is
(length) times (width).
Area of Jarel's garden = (9-ft) x (3-ft) = 27 square-feet
Area of Morgan's garden = (6-ft) x (6-ft) = 36 square-feet .
Morgan's garden has more area.
(36 square-feet) - (27 square-feet) = 9 more square-feet .