#### Answer

$A = 1.12~R^2$

#### Work Step by Step

$A = [5~\frac{sin~A~sin~B}{sin~(A+B)}]~R^2$
$A = [5~\frac{sin~18^{\circ}~sin~36^{\circ}}{sin~(18^{\circ}+36^{\circ})}]~R^2$
$A = [5~\frac{(0.309017)(0.587785)}{(0.809017)}]~R^2$
$A = 1.12~R^2$

Published by
Pearson

ISBN 10:
978-0-13-421743-7

ISBN 13:
978-0-13421-743-7

$A = 1.12~R^2$

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