Survey Math Review - Stumped

February 13, 2009

Posted By Garry Bunk on 2/12/2009 at 9:42 AM

I am working through the CALTrans LS/LSIT Review Course (no I am not from CA) and see quite a few type-o's and am wondering about the following problem:

I am using the Law of Cosines with this problem and am ending up with 1/COS A = 0/397.16². Am I doing something wrong? Are one of the sides AB or AC a type-O? The Answer key says the answer = D.