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In 2008, the last question of Ningbo mathematics examination questions was the fourth question.
I'm lazy, question four.

1.S = 3a 2/ 16 When the upper bottom and the lower bottom are on opposite sides of the quarto paper.

2. When this right-angled trapezoid is placed obliquely, there is (as shown in the figure) S = 15A 2/64 (take the vertex m as the midpoint of the short side of the 4-sheet paper). Please refer to the third question for the specific solution, which is actually the hint of the fourth question.

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