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D在第二象限,所以只能是AB為正方形一條邊,從D點做垂線DE,從B點做垂線BF垂直於X軸,則三角形ADE和三角形BAF全等,可以直接算出來D座標是(-2,4),於是又由於AB與CD是平行且相等的,可以推知C座標為(2,7)
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