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顯然在正方形ABCD的4個頂點都在同一個圓的圓周上, 而AC中點O(2.5,6.5)即為圓心, 同理B點和D點到O的距離也相等,即O為BD的中點 設D的座標為(x,y) 所以(x+6)/2=2.5,(y+6)/2=6.5 解得x= -1,y=7 即D點座標為(-1,7)
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