Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 10 - Geometry - 10.4 Area and Circumference - Exercise Set 10.4: 15

Answer

C = 25.1 cm, A = 50.3 $cm^{2}$

Work Step by Step

Given r = 4 cm The formula for circumference of a circle is: C = 2$\pi$r = 2$\pi$ x 4 = 8$\pi$ = 25.1 cm The formula for area of a circle is: A = $\pi$ $r^{2}$ =$\pi$ $4^{2}$ = 16$\pi$ $cm^{2}$ = 50.3 $cm^{2}$
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