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如图1,在梯形ABCD中,AD∥BC,两条对角线AC和BD相交于点O,梯形的腰和对角线交成的△abo(或△DCO)称为腰旁三角形,它的面积
In Figure 1, in the trapezoid ABCD, AD ∥ BC, the two diagonal lines AC and BD intersect at the point O, and the trapezoidal waist and diagonal intersection △abo (or △DCO) are called waistline triangles. Area