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.
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: 5
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