问题
选择题
以点P(-4,3)为圆心的圆与直线2x+y-5=0相切,则圆的半径r的值是( )
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答案
∵以点P(-4,3)为圆心的圆与直线2x+y-5=0相切,则圆的半径r=
=2|-4×2+3-5| 22+12
.5
故选C.
以点P(-4,3)为圆心的圆与直线2x+y-5=0相切,则圆的半径r的值是( )
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∵以点P(-4,3)为圆心的圆与直线2x+y-5=0相切,则圆的半径r=
=2|-4×2+3-5| 22+12
.5
故选C.
书面表达。 | ||||
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