Question

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Answer 1

the circumference is 20 inches. use pi

Answer 2

\[2\pi(r)=20\]
\[r=\frac{20}{2\pi}\]
\[r=\frac{10}{\pi}=3.183\]

Answer 3

how do u get 3.185

Answer 4

Different types of calculator will give different round off result!

Answer 5

is it 40

Answer 6

I'm just explain the result from calculator, but I'm unsure your question about 40?