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.
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
画图,不能想当然
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
傻了,我光想这根本不能确定y点的位置了
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
1+2 y一定在圆外
一定在圆外!!
条件1肯定不充分因为不知道y的情况。条件2,如果xy距离是9,px的距离是4.5,根据三角形的性质,py的长度一定大于三角形其他两边的差,也就是9-4.5=4.5大于圆的半径,所以y在圆外。
哈哈我的想法跟底下的同学一样,这都能错233333.服了自己了。4+4.5算不对。
这都能错。。。。。
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
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
看清楚题目,题目问的是point Y lie outside the circular area,我做题的时候看成inside
在确认答案前,请确认是否每个选项考虑充分!2的9距离一定在圆外!