This image represents points (x,y) that satisfy the equation:

π
/4 = tan^{-1}(y_{1}/x_{1})
+ 3 tan^{-1}(y_{2}/x_{2})
+ tan^{-1}(y_{3}/x_{3}).

Thousands of triangles comprise this image. In each, the corners are
the points (x_{1},y_{1}), (x_{2},y_{2}),
and (x_{3},y_{3}).

© 2013 Kerry Mitchell