Calling all mathematicians! Can you answer this question?

You are not allowed a calculator and have between 6-8 minutes to answer it

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SomeMichGuy · M

Neat. Fun diversion.

Odd to give a specific radius, yet ask for an answer in terms of π...very odd.

BabyLonia · F

@SomeMichGuy actually when you see my workings it will make sense

SomeMichGuy · M

@BabyLonia Ok. 😊👍 I did it for a general 'r', but that's typical.