Questions about the use of radialGradient in svg

  1. learn the radialGradient method of svg
  2. effect
    clipboard.png


  3. clipboard.png
    my understanding is, from the point (fx, fy) = > point (cx, cy), but I do not know how to understand this radius, I hope the boss who knows it will specify it. Thank you?
Svg
Mar.15,2021
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