Just a bit confused, I need to find x:

http://img212.imageshack.us/img212/8729/chords1iu3.png

If I were to add a y, then I could do this:

$\displaystyle y=1/2(122+32)$

$\displaystyle y=1/2(154)$

$\displaystyle y=77$

$\displaystyle x=180-77$

$\displaystyle x=103$

If not, is there another way to do it? My book did not cover this. :(