问题
单项选择题
In the figure above, P and S are points on the x-axis. What is the area of square PQRS ?()
(1)The coordinates of point P are (2, 0)
(2)The coordinates of point R are (6, 4)
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
答案
参考答案:B
解析:
根据P点的坐标是(2, 0),得不到正方形PQRS边长方面的信息,所以(1)不充分;根据点R的坐标是(6, 4)可以得出RS=4,从而可以求出正方形PQRS的面积等于16,所以(2)充分。