问题
单项选择题
已知平行四边形的三个顶点是A(4，2)，B(5，7)，C(-3，4)，则第四个顶点D不可能是( )。
A．(12，5)
B．(-2，9)
C．(-4，-1)
D．(3，7)
答案
参考答案：D
解析： 可画出坐标图，从图上求解。可观察出当D(3，7)时，四边形ABCD不为平行四边形。故选D。
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已知平行四边形的三个顶点是A(4，2)，B(5，7)，C(-3，4)，则第四个顶点D不可能是( )。
A．(12，5)
B．(-2，9)
C．(-4，-1)
D．(3，7)
参考答案：D
解析： 可画出坐标图，从图上求解。可观察出当D(3，7)时，四边形ABCD不为平行四边形。故选D。
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