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。

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