从A作DE垂线,与DE延长线相交于H,两个三角形CDE与DAH全等-> AH =6, 因此 三角形DAE面积 为 (1/2)*DE*AH = 18
从A作DE垂线,与DE延长线相交于H,两个三角形CDE与DAH全等-> AH =6, 因此 三角形DAE面积 为 (1/2)*DE*AH = 18
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