Answer:
82.8 degrees
Step-by-step explanation:
The information given here SSS. That means side-side-side.
So we get to use law of cosines.
Let's enter are values in.
I'm going to a little simplification like multiplication and exponents.
I'm going to some more simplification like addition.
Now time for the solving part.
I'm going to subtract 164 on both sides:
I'm going to divide both sides by -160:
Simplifying left hand side fraction a little:
Now to find B since it is inside the cosine, we just have to do the inverse of cosine.
That looks like one of these:
or
Pick your favorite notation there. They are the same.
To the calculator now:
Round answer to nearest tenths: