Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 5 - Section 5.3 - Multiplying Decimals and Circumference of a Circle - Exercise Set: 53


$C=10\pi\approx 10\times3.14=31.4$ square cm

Work Step by Step

The circumference of a circle can be calculated as: $C=2r\pi=d\pi$ where r is the radius and d is the diameter. Here: $d=10$ cm $C=10\pi\approx 10\times3.14=31.4$ square cm.
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