\sigh This is a long one. Time to play with graphing programs.
So you have three sets of linear equations for each vertex of the triangle. Each solution for each on is
,(-2\frac{3}{8},\frac{7}{8}),(-5\frac{1}{5},-7\frac{3}{5}))
So take the midpoint of
)
and
)
which is
)
. Now take the distance between the midpoint and two endpoints, and multiply the two distances and divide by two to get the answer.
I have to go soon so someone can finish it up.