Mode
Click two points to draw a geodesic
Tessellation {p,q}
Hyperbolic Distance
Click two points to measure
About
The Poincaré disk model puts all of hyperbolic space inside the unit disk. Geodesics (straight lines) are circular arcs perpendicular to the boundary. Through any point not on a line, infinitely many parallel geodesics exist — violating Euclid's 5th postulate. Hyperbolic distance: d = 2·arctanh(|z|). The {7,3} tessellation tiles the disk with 0-π heptagons.