#### Answer

$S=kr^{2}\theta^{2}$

#### Work Step by Step

Since $S$ is directly proportional (jointly) to the square of $r$ and the square of $\theta$, we have::
$S=kr^{2}\theta^{2}$
(and $k$ is a constant.)

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

$S=kr^{2}\theta^{2}$

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