Right Circular Cone Basics
The following figure shows an example of a right circular cone:
Note that the cross section of this cone is circular. This means that if you cut the cone anywhere with a horizontal plane, you will get a circular cross-section:
Also, the axis of the cone is perpendicular to the base, and hence it is right:
The following figure shows a cone which is right but not circular (the cross-section is elliptical):
The figure below shows a cone which is circular but not right (the axis is not perpendicular to the base):
From now on, we will discuss only right circular cones, and we will refer to them as simply cones. The dimensions of a cone can be specified by two parameters: the radius \(r\)of the base or the flat surface, and the height \(h\) of the cone, as shown below.