This image represents points (x,y) that satisfy the equation:
© 2013 Kerry Mitchell
π
= tan-1(y1/x1)
+ 3 tan-1(y2/x2)
+ tan-1(y3/x3).
Thousands of triangles comprise this image. In each, the corners are
the points (x1,y1), (x2,y2),
and (x3,y3).