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题目如图1所示:四边形ABCD中,AB⊥BC,AD⊥DC,∠A=135°,BC=6,AD=23~(1/2),求四边形ABCD的面积.
The title is shown in Figure 1. In quadrilateral ABCD, AB⊥BC, AD⊥DC,∠A=135°, BC=6, AD=23~(1/2), find the area of quadrilateral ABCD.