Answer
$40000t\pi$
Work Step by Step
We know that $A(r)=r^2\pi$.
By the text of the exercise $A(r)=A(r(t))=A(t)=r^2\pi=(200\sqrt t)^2\pi=40000t\pi$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 6 - Section 6.1 - Composite Functions - 6.1 Assess Your Understanding - Page 409: 62
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