标题: OG-17-Q数学 [打印本页] 作者: 神粥八宝 时间: 2017-12-18 11:02 标题: OG-17-Q数学 In the xy-plane, the points (c, d), (c, -d), and (-c, -d) are three vertices of a certain square. If c < 0 and d > 0, which of the following points is in the same quadrant as the fourth vertex of the square?