'Pi' is just a number.
The question is a lot like saying "Find your birthday in 6."
It's quite meaningless.
In fact, reading the question again closely, we notice that there's isn't even a question there.
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Pi times r times r or Pi r squared is the formula for finding the area of a circle where r is the radius
Circumference of a circle is (pi * diameter). Area of a circle is (pi * r2).
4-(4/3)+(4/5)-(4/7)+(4/9)-(4/11)....=pi There are no non-infinite serieses known for finding pi
2[4(radius)/3(pi)]
The same as finding the area of a circle which is: pi*radius2