Covering Circle Radius versus Extreme Spread

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The figure below illustrates the difference between the Covering Circle Radius and the Extreme Spread measurements. Given that AB is the extreme spread measure, a back circle which has AB as a diameter has been drawn. At points A and B, red circles have been drawn with a radius of AB.

Covering circle.jpg

Thus points in the green region are:

  • Outside circle that has AB as a diameter
  • Closer to A than B
  • Closer to B than A

So if a shot happens to fall in the green region, then the covering circle radius will have to be more than 1/2 of the ES.