If, by pie you mean π, then there is no such equation since π is an irrational number and that means it cannot be represented by decimal that is either finite or recurring. It has an infinite decimal representation with no pattern in its digits. So there is no end.
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Use the equation that shows the relationship between ohms and the properties that are known.
By eating a pie
you have to use it in a problem.
radius squared multiplied by pie
Missing....? But the answer to find the missing is normally either "algebra" or "find another equation to use."