Fig. 3From: Mechanics of moving defects in growing sheets: 3-d, small deformation theoryHyperbolic surfaces in \(\mathbb {R}^{3}\). The inscribed (geodesic) triangle in the smooth saddle has angles that sum up to less than π, illustrating the connection between the extrinsic and intrinsic geometries – Gauss’ Theorema EgregiumBack to article page