问题
选择题
已知A(1,0).B(7,8),若点A和点B到直线l的距离都为5,且满足上述条件的直线l共有n条,则n的值是( )
A.1
B.2
C.3
D.4
答案
与直线AB平行且到直线l的距离都为5的直线共有两条,分别位于直线AB的两侧,由线段AB的长度等于10,
还有一条直线是线段AB的中垂线,故满足上述条件的直线l共有3条,
故选C.
已知A(1,0).B(7,8),若点A和点B到直线l的距离都为5,且满足上述条件的直线l共有n条,则n的值是( )
A.1
B.2
C.3
D.4
与直线AB平行且到直线l的距离都为5的直线共有两条,分别位于直线AB的两侧,由线段AB的长度等于10,
还有一条直线是线段AB的中垂线,故满足上述条件的直线l共有3条,
故选C.
阅读理解。 | ||||
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