As shown in the figure, the upper bottom of trapezoidal aebd is 1.4 decimeters, the lower bottom is 3.2 decimeters, and the area of triangle Abe is 1.54 square decimeters
1.54 × 2 △ 1.4 = 2.2 (decimeter), trapezoid area: (1.4 + 3.2) × 2.2 △ 2, = 4.6 × 2.2 △ 2, = 5.06 (square decimeter), rectangle area: (5.06-1.54) × 2 = 7.04 (square decimeter); answer: rectangle ABCD area is 7.04 square decimeter