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From what? You need other variables you can use in the standard circle formulae from which to calculate the radius.
To evaluate means to find the value. Substitute the values of the variables and calculate the value. [You may need to solve for the values of the variables first.]
Variables work by telling you what you need to change, what to observe, and what to keep the same in a experiment.
Since there are two variables in this sum, without knowing what one of the variables is, it is impossible to calculate the other variable.
The answer will depend on what variables are graphed!