Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Appendix A - A.1 - Algebraic Expressions - Exercises - Page 543: 20a

Answer

3$\pi$$r^{2}$

Work Step by Step

$\pi$$r^{2}$ + 2$\pi$$r^{2}$ = 1$\times$$\pi$$r^{2}$ + 2$\times$$\pi$$r^{2}$ = (1+2)$\times$$\pi$$r^{2}$ = 3$\pi$$r^{2}$
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