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.

选择题
阅读理解
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