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Which of the following equations can be used to solve for the radius (r)?

Formula: A= 3.14r^2

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You did not include the equations that you want to assess whether they can be used to solve for the radius (r). Likely, the equation of the circumference, C = 2*Pi*r is included, if so => r = C / (2*Pi). If you round Pi to 3.14, the equation may be written r = C / 6.28.

User Thorsten Lorenz
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