Radius Command

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Radius[Circle]
Returns the radius of the circle.
Example:
Returns the radius of a circle c (e.g. c:(x - 1)² + (y - 1)² = 9)
Radius[c] yields a = 3
Example:
Returns the radius of a circle formula
Radius[(x - 2)² + (y - 2)² = 16] yields a = 4
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