三角麵積是1/2*底*高。ABE的麵積是1/2*3X*H=42、x*h=84/3=28
BCD的麵積是1/2*4X*H=2X*H,上麵的X*H=28を代入、得56
実際上、BEF=18,那末、就是18/56=9/28
三角麵積是1/2*底*高。ABE的麵積是1/2*3X*H=42、x*h=84/3=28
BCD的麵積是1/2*4X*H=2X*H,上麵的X*H=28を代入、得56
実際上、BEF=18,那末、就是18/56=9/28
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