Case number 39

Rotating surface of constant negative curvature Rotational surface of constant negative curvature; cone type Rotational surface of the tractrix of constant negative curvature Helical surface
Areas developable on rotational paraboloid Surfaces developable on rotational paraboloid Minimal surface according to Catalan Minimal surface according to Tallquist
Catenoid Helical surface Catenoid made of pliable brass plate

The corresponding bottom case is: Case number U 39

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