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The circumference of a circle is given by
\[2*\pi*r\]

and lets say we pick r=1 we get
\[2*\pi\]

now lets say that we multiply the radius by 4 so now r=4

\[8*\pi\]

8 pi is 4 times bigger than 2 pi

so whats the answer

Look at my last post

so what do i do next

so is 32

wait can you tell me what the original radius equals?

i really dont know

Answer is 4

thanks