# If A = 40°, B = 60°, and a = 20, find b

If , and $a=20$, find $b$.

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Faiza Fuller

Use the Law of Sinse: $\frac{\mathrm{sin}A}{a}=\frac{\mathrm{sin}B}{b}$
Substitute given , and $a=20$, then find $b$:
$\frac{\mathrm{sin}{40}^{\circ }}{20}=\frac{\mathrm{sin}{60}^{\circ }}{b}$
$b=\frac{20\mathrm{sin}{60}^{\circ }}{\mathrm{sin}{40}^{\circ }}$
$b=26.9$