2. 外语
  3. Suppose ABCD is a rectangle, O is the center of the circle. If the coordinates of O are (-1, 0), coordinates of A are (-2, 1), a

Suppose ABCD is a rectangle, O is the center of the circle. If the coordinates of O are (-1, 0), coordinates of A are (-2, 1), a

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问题 Suppose ABCD is a rectangle, O is the center of the circle. If the coordinates of O are (-1, 0), coordinates of A are (-2, 1), and coordinates of D are (3, 6) then what are the coordinates of C?
选项 A、(5, 6)
B、(6, 5)
C、(6, 4)
D、(4, 6)
E、(5, 4)
答案E
解析 ABCD是个长方形，O是圆心，A(-2，1)，D(-1，0)，D(3，6)，那么AO=OB，AB=DC。又知，以上线段平行或方向一致，则AO两点的横纵坐标差与OB两点的横纵坐标差相等，得出B(0，-1)；AB两点的横纵坐标差与DC两点的横纵坐标差相等，得出C(5，4)。所以答案为E选项。
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