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.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
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 - Page 64: 6
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