Answer
$$A=\pi(a^2+b^2)$$
Work Step by Step
We know that the length of the radius is:
$$ r^2=a^2+b^2 $$
Thus, the area is:
$$ A = \pi r^2 \\ A=\pi(a^2+b^2)$$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 10 - Section 10.3 - Preparing to Do Analytic Proofs - Exercises - Page 468: 38
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