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(incase the inline image doesn't work: http://imgur.com/4FVpan3)

I'm stuck on problem 1.38. I know how to do it if the walls were orthogonal but since they aren't I'm stuck. I know how he's getting the 202 in the square root etc, but i have no idea where he's getting the 168cos(thetha) and subtracting it from. Can someone give me some tips about how to go about solving this problem? Thanks!