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system
create a trigonometry problem.
user
find the length of the side labelled as x in the triangle shown below, given that angle a is 40 degrees, and angle b is 50 degrees:
\                                     /\ 
 \                        b          /  \ 
  \                     __|__       /    \ 
   \                    |  |       /      \ 
    \                   |  |      /        \ 
     \                  |  |     /          \ 
      \                 |  |    /            \ 
       \                |  |   /              \ 
        \          a    |  |  /                \ 
         \               |  | /                  \ 
          \______________|  |/____________________\ 
            \              x                       \ 
             \______________________________________\ 

the length of side x is 16.7 cm.
assistant