Trigonometry Help

[WTF?]

Hello, I'm in need of a bit of a push here. How would I go about finding x ?

I'm aware of the trigonometry identities, so cosine would be suitable for this one, right?

I need help on how to set this sucker up,

so is it:
\(\displaystyle cos55=(11.5/X)\)

Then:
\(\displaystyle xCos55=11.5\)

Then:
\(\displaystyle xCos55/(Cos55) = 11.5/(Cos55)\) or do I need to divide by 55 and then multiply 11.5 by Cos^-1 (inverse cosine)

 

[Gene]

nope, you've got it. X=11.5/cos(55).