Answer
$4$
Work Step by Step
Step 1. Starting area: $A_1=\pi\ r^2$
Step 2. Ending area: $A_2=\pi\ (2r)^2=4\pi\ r^2$
Step 3. Factor of change: $\frac{A_2}{A_1}=4$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.6 Rational Exponents - R.6 Exercises - Page 65: 118
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