Answer:
[tex]\displaystyle 15[/tex]
Step-by-step explanation:
Divide the circumferense by π like so:
[tex]\displaystyle \pi{d} = C \\ \\ \frac{47,1}{3,1415926536...} = d; 14,992395639... \\ \\ \boxed{15 \approx d}[/tex]
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