Well hello again :3. This is also quite simple. The diameter of a circle is 2 times the radius. So we can refit this into the equation and say that our new formula using diameter is 
. Now we can say that 10/2 is 5 and 
is 25. Therefore your answer is 
or 78.54.
Is my dog cute?? And it has to be 20 characters so....
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