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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One third of pi multipled by the square of the radius
Radius is 4,squared is 16
Multiply by pi is 50.26
One third of that is final answer 16.75
Best I can do.

helenS · 36-40, F

@tallpowerhouseblonde Yes that's what I had also assumed, see below.
It was just a guess, I did not calculate.

tallpowerhouseblonde · 31-35, F

@helenS I did briefly think it was a quarter because it's easier to work out,the radius squared and the quarter cancelling each other out but changed my thinking to a third of a circle.