[計量] pp2-DS-167
167. 16727-!-item-!-187;#058&011198
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.
答案是 C
為和不是E?
條件1會知道X一定在圓外,但不知Y
條件2只知道XY沒用
但條件合起來,
只說兩點和這個原在同一平面
Y可以是任意點吧？
為和一定要切過圓？
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