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: 5

Answer

You can help your friend by pointing out that area is measure in square units.

Work Step by Step

Since $2\pi r$ does not square the radius, we know this formula is for the perimeter rather than the area of the circle.
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