Why didn't I get this SAT Math question right? Help?

xxeliza321xx
Wed, 29 Aug 2012 15:20:07 +0000

What’s wrong with this picture?

http://i252.■■■■■■■■■■■■■■■/albums/hh17/xxEliza321xx/Photoon2012-08-29at1508.jpg

I’m talking about question 15, the one with the triangles. The answer is supposed to be 1/2 or .5. So what’s wrong with what I did?