过圆(x-1)²+(y-3)²=16外一点P(4,9)引圆的切线长为?
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过圆(x-1)²+(y-3)²=16外一点P(4,9)引圆的切线长为?
过圆(x-1)²+(y-3)²=16外一点P(4,9)引圆的切线长为?
过圆(x-1)²+(y-3)²=16外一点P(4,9)引圆的切线长为?
根号29
过圆(x-1)²+(y-3)²=16外一点P(4,9)引圆的切线长为?
过圆(x-1)²+(y-3)²=16外一点P(4,9)引圆的切线长为?
过圆(x-1)²+(y-3)²=16外一点P(4,9)引圆的切线长为?
根号29