SOLUTION: Determine < B to the nearest degree, where 0o < B < 180o, for cos B = -0.311 How do you solve the kinds of questions?

Algebra ->  Trigonometry-basics -> SOLUTION: Determine < B to the nearest degree, where 0o < B < 180o, for cos B = -0.311 How do you solve the kinds of questions?       Log On


   

Question 825706: Determine < B to the nearest degree, where 0o < B < 180o, for
cos B = -0.311
How do you solve the kinds of questions?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
take the arccosine of both sides to get...

cos(B) = -0.311

arccos(cos(B)) = arccos(-0.311)

B = 108.119505 ... this value is approximate (and requires a calculator to find it)

B = 108 ... final answer