由 BE:EA=2:3 =>CG :GD=2:3
同高三角形,底邊比=麵積比 =》 8:陰影三角形GFD=2:3 或 8/GFD=2/3
GFD=12
矩形OGDH=2*12=24
由 BE:EA=2:3 =>CG :GD=2:3
同高三角形,底邊比=麵積比 =》 8:陰影三角形GFD=2:3 或 8/GFD=2/3
GFD=12
矩形OGDH=2*12=24
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