π 11

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