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如下图所示,有大小两个正方形,大正方形ABCD边长是6cm。EC和AD相交于点H,并且DH=2cm。请问:梯形AEFD的面积是多少?我是这样解的。显然,梯形AEFD的上底和高都和小正方形的边长相等,要求它的面积,必须要知道小正方形的边长,可是怎样才能求出小正方形的边长呢?不妨将三角形EFC暂时从整体图形中移出来,变成右下图来单独研究。静下心来,仔细观察,是不是有
As shown below, the size of two square, large square ABCD side length is 6cm. EC and AD intersect at point H, and DH = 2 cm. I ask: trapezoidal AEFD area is what? I was so solution. Obviously, the trapezoid AEFD upper and bottom are the same as the length of a small square, requiring its area, we must know the small square side length, but how to find the small square side length? Triangle EFC may wish to temporarily from Moved out of the overall graphics, into the bottom right to study separately. Quietly, careful observation, is not there