hyperbolic triangle 344

This is a 344-triangle on a piece of the hyperbolic plane. A 344-triangle has angles π/3, π/4 and π/4, so 60°, 45° and 45°. The interior angle sum adds to less than 180°, which is possible in hyperbolic geometry.

The isometric embedding of the hyperbolic plane is realized as a part of Kuen's surface.

https://mathcurve.com/surfaces.gb/kuen/kuen.shtml