In cylindrical coordinates, the equation z equals r gives one of these shapes.
This shape consists of all the points in spherical coordinates for which rho goes from zero to a constant times cosine phi, and phi goes from zero to a constant less than pi over two. Spheres tangent to one of these and a plane are called Dandelin spheres. In cylindrical coordinates, the equation z equals r gives one of these shapes. Name this shape whose slices are used to generate ellipses, parabolas, and hyperbolas, and which has a volume equal to one-third pi times r squared times h.
This shape consists of all the points in spherical coordinates for which rho goes from zero to a constant times cosine phi, and phi goes from zero to a constant less than pi over two.
cones (accept double cone or conic)