# Math: law of cosines, help?

### 2 Answers

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- Engr. RonaldLv 74 months agoFavorite Answer
Apply law of sin

....a...............b

----------- =----------

..sin(A).......sin(B)

....12...............15

------------ =--------------

..sin(33)........sin(B)

...12sin(B) = 15sin(33)

sin⁻¹(B) = 0.68

B = 43° Answer//

Answer is B. 43

- fcas80Lv 74 months ago
Law of Sines: sin B/15 = sin33/12

sinB = 15 * sin33/12

sin33 = .5446

sinB = 15 * .5446/12 = .681

arcsin(.681) = 42.92. answer B

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