Need math help with #4 (please answer correctly, chat me for answer choices)

Mathematics
Tutor: None Selected Time limit: 1 Day

Nov 20th, 2015

Thank you for the opportunity to help you with your question!

EG is the radius which is 10mm, circumference=pi*d=2pir=20pi

the answer is 20pi mm

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 20th, 2015

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