Back around the time I first joined brainden I posted a favorite puzzle of mine:

It didn't take long for the brainden elite to crack it using calculus. Surprisingly and grateful though, I also saw the use of geometry (my favorite subject!!) to crack it too and as a result, I have been hooked to this site ever since.

I am now modifying the problem slightly. The challenge here of course is to not use calculus except to verify if needed. Here we go:

Suppose the area of the innermost intersection is Pi, can we extrapolate back to the circle's original radius?

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## BMAD

Back around the time I first joined brainden I posted a favorite puzzle of mine:

It didn't take long for the brainden elite to crack it using calculus. Surprisingly and grateful though, I also saw the use of geometry (my favorite subject!!) to crack it too and as a result, I have been hooked to this site ever since.

I am now modifying the problem slightly. The challenge here of course is to not use calculus except to verify if needed. Here we go:

Suppose the area of the innermost intersection is Pi, can we extrapolate back to the circle's original radius?

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