#### Answer

36$\pi$-72 in$^2$

#### Work Step by Step

A$_{sector}$=$\frac{90}{360}$($\pi$12$^2$)
A$_{sector}$=$\frac{1}{4}$(144$\pi$)
A$_{sector}$=36$\pi$
A$_{triangle}$=.5(12)(12)
A$_{triangle}$=72
A=36$\pi$-72

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Published by
Brooks Cole

ISBN 10:
9781285195698

ISBN 13:
978-1-28519-569-8

36$\pi$-72 in$^2$

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