Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 1 - Tools of Geometry - 1-8 Perimeter, Circumference, and Area - Lesson Check: 6

Answer

The classmate forgot to multiply by $\pi$.

Work Step by Step

The area of a circle is $\pi r^2$. If the radius is 30 inches, $r^2=900$. 900 must be multiplied by $\pi$ to find the area.
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