4-2 Developable surfaces 157
Fig. 4.3. Gauss flat surface (k = 0) of type plane. Here: tangent plane of the sphere attached to the North
Pole: “developable”.
Fig. 4.4. Gauss flat surface (k = 0) of type cylinder. Here: cylinder wrapping the sphere, equator is the
line-of-contact: “developable”.
Fig. 4.3. Gauss flat surface (k = 0) of type plane. Here: tangent plane of the sphere attached to the North
Pole: “developable”.
Fig. 4.4. Gauss flat surface (k = 0) of type cylinder. Here: cylinder wrapping the sphere, equator is the
line-of-contact: “developable”.