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标题: TTGWD11-21 [打印本页]

作者: amyding85 时间: 2006-9-6 18:08
标题: TTGWD11-21

Q21:

A certain circle in the xy-plane has its center at the origin. If P is a point on the circle, what is the sum of the squares of the coordinates of P?

(1) The radius of the circle is 4.

(2) The sum of the coordinates of P is 0.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

Answer: A

能不能翻译以下 squares of the coordinates of P?什么意思呢？

作者: jenny22 时间: 2006-9-6 18:40
如果p的坐标是（x，y）, 那么squares of the coordinates of P 就是x^2+y^2

作者: caoqin1981 时间: 2011-10-3 12:30
问题没看懂，原来是问P点坐标的平方和。

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