Answer
$\frac{sine 40°}{5}$ = $\frac{sine β}{8}$
Work Step by Step
Given a=5 b=8 and α =40°
By law of sines
$\frac{sine α}{a}$ = $\frac{sine β}{b}$
$\frac{sine 40°}{5}$ = $\frac{sine β}{8}$
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