#### Answer

$55 \pi$

#### Work Step by Step

$S_{n}=\dfrac {a_{1}+a_{n}}{2}\times n=\dfrac {\pi +10\pi }{2}\times 10=55\pi $

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$55 \pi$

$S_{n}=\dfrac {a_{1}+a_{n}}{2}\times n=\dfrac {\pi +10\pi }{2}\times 10=55\pi $

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