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我估計是求三角形EFC面積,連接BD,連接AC,AC交EF於G,CG垂直於EF,先求BD邊長為根下2,在等腰三角形BCD中,等腰線EF=BD/2,然後CG=AC/4,這樣就知道ECF的底和高,就可以求面積了,如果陰影是另外一塊,那就用正方形面積减去上面求得面積就得到了
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