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圓心是(0,0),則有圓心到直線的距離是d=|1|/根號(1+1)=1/根號2=根號2/2 又半徑R=5 那麼圓上的一點到直線的最大距離是R+根號2/2=5+根號2/2,最小距離是R-根號2/2=5-根號2/2
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