The curvature of one of these three-dimensional shapes can be given as four divided by the quantity one plus four u quantity squared. A symmetric section of one of these figures divides the volume of its circumscribed cylinder into equal halves. Though the second-order mixed derivatives of this shape are zero, its other second-order derivatives are positive. This shape has an elliptic type and a type that is generated by the equation z equals x times y. That type, which contains a saddle point, is the hyperbolic type. This three-dimensional shape is taken by spinning pools of liquid, which is 
The curvature of one of these three-dimensional shapes can be given as four divided by the quantity one plus four u quantity squared. A symmetric section of one of these figures divides the volume of its circumscribed cylinder into equal halves. Though the second-order mixed derivatives of this shape are zero, its other second-order derivatives are positive. This shape has an elliptic type and a type that is generated by the equation z equals x times y. That type, which contains a saddle point, is the hyperbolic type. This three-dimensional shape is taken by spinning pools of liquid, which is why spinning mercury can be used as a telescope. Name this shape that consists of all points the same distance from a plane and a point focus.
The curvature of one of these three-dimensional shapes can be given as four divided by the quantity one plus four u quantity squared.