Can someone please help me please. I would really appreciate it :)

Question

anonymous · Answer

attachment

miracrown · Answer

|dw:1384500163106:dw|

Alright we are going to have to use the law of cosines to get an angle here. Do you know what the law of cosines says?

anonymous · Answer

No I do not
:(

anonymous · Answer

I think its A, but I am sure I am wrong.

miracrown · Answer

Don't worry! :)
ok... well let me write it up for us... which angle would you like to solve for ?

anonymous · Answer

I think it wants me to solve all of them

miracrown · Answer

so let's get <A first... that is fine with me!

anonymous · Answer

I am so confused lol, I am sorry. I am not usually this clueless.

anonymous · Answer

Okay :) sounds like a plan

miracrown · Answer

|dw:1384500402812:dw|

That first line is the formula... the law of cosines. The second line there is what we were given, plugged into the formula. Can you solve that equation so the cos A part is on a side by itself?