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

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