For 10 points, name this shape, a pyramid with a circle at its base.
This shape is formed by setting rho to be the secant of phi, and varying theta, in spherical coordinates. A common example of Cavalieri's principle sets the volume outside one of these shapes equal to the volume of a sphere. One is formed by the equation z = r [z equals r].  Truncating this shape gives a (*) frustum. If a triangle has a right angle on the origin, then rotating it about either axis produces this shape. Cutting a nappe [NAP] pair of these shapes with a plane can produce a circle, ellipse, hyperbola, or parabola. Its surface area equals pi times r times the quantity r plus L, where L is the lateral distance. For 10 points, name this shape, a pyramid with a circle at its base.
This shape is formed by setting rho to be the secant of phi, and varying theta, in spherical coordinates.
right circular cone