Question

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

Explanation:

Use the Law of Sines here:

`(sin120)/(8) =(sinB)/(3)` and cross multiply to get

8sinB = 3sin120 and solve for B:

`sinB=(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.