Sorry for the re-post 1. The problem statement, all variables and given/known data http://books.google.ca/books?id=nYR...g direction cosines to measure height&f=false The obove link has a coopy of the question as it is hard to describe. If you find the link is too hard to read here is the data Direction cosines: of Rap(from point a to top of mountain): cos theta x= .5179 cos theta y= .6906 cos theta z= .5048 of Rbp(from point b to top of mountain): cos theta x=-.3743 cos theta y=.7486 cos theta z=.5472 b and a are 10000m apart. Find how high point p is. It is on page 57 #2.82 (The mount everest question) 2. Relevant equations 3. The attempt at a solution I attemted the question in a number of ways but can't seem to come to an answer. I tried Looking at it as two right angled triangles and using trig. Im not really sure what i can do with the direction cosines either.