"If A=40∘,B=60∘, and a=20, find b." was answered by our community

necessaryh

Answered question

2021-06-09

If $A = 40^{\circ}, B = 60^{\circ}$ , and $a = 20$ , find b.

Pohanginah

Skilled2021-06-10Added 96 answers

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

$\frac{\sin 40^{\circ}}{20} = \frac{\sin 60^{\circ}}{b}$

$b = \frac{20 \sin 60^{\circ}}{\sin 40^{\circ}}$

$b \sim 26.9$

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