Thread: [SOLVED] Cosine rule 2

If you could help me in any way it would be great!!! I accidently typed the wrong question!(I sometimes wonder how I got into this maths class=])
this is the right question:
A boat travels 6.3km due north and then turns 17degrees towards the west and travels a further 7.2kms. How far is it from it's initial position?

x^2=6.3^2+7.2^2-2(6.3)(7.2)cos17
x^2=91.53-90.72Xcos17
x^2=91.53-86.76
x^2=4.77
x=2.18

any help would be great! Thank you for taking the time to help me with my trig h/w!!

I think you should try this... ?!

Hello, xch3m_is_l0v3x!

You didn't make a sketch, did you?

A boat travels 6.3km due north .
and then turns 17° towards the west .
and travels a further 7.2kms. .
How far is it from it's initial position?

Code:

    C *           N
       \\         :
        \ \ 7.2   :
         \  \     :
          \   \17°:
           \    \ :
            \     * B
             \    |
              \   |
               \  | 6.3
                \ |
                 \|
                  * A

Get it? . . . You should have used: