Question

In triangle ABC, if ∠A = 120°, a = 8, and b = 3, then ∠B =
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Answer 1

Answer:

Step-by-step explanation:

Use the Law of Sines here:

$\frac{sin120}{8} =\frac{sinB}{3}$ and cross multiply to get

8sinB = 3sin120 and solve for B:

$sinB=\frac{3sin120}{8}$ and

sinB = .3247595264

Now hit the 2nd button and then sin to get

$sin^{-1}($      

on your display. After that open parenthesis, enter that decimal and hit enter to get that angle B = 18.95 which you can round to howeve many places you need.