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题库 / Prep2007E2-DS-167
A certain circular area has its center at point P and has radius 4, and points X and Y lie in the same plane as the circular area. Does point Y lie outside the circular area?
(1) The distance between point P and point X is 4.5.
(2) The distance between point X and point Y is 9.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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一个平面上，有一个圆，圆心P，半径4， X,Y两点跟圆在同一个平面上，
问Y点在圆外吗？
条件1：点X和p的距离是4.5 ，那么点X在圆外， 不知道点Y情况，insufficient
条件2：X，两点距离是9， 不知道X的位置， insufficient
1+2： Y如果要在圆内，XY之间的距离必须大于0.5，小于8.5 距离是9的话，Y点肯定在圆外
选C
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