Right Circular Cone
In a right circular cone, the axis is perpendicular
to the base. (If the axis of a
circular cone is not perpendicular to the base, it
is called an oblique circular cone.)
The length of any line segment connecting the vertex
to the directrix is called the
slant height of the cone. 
Height: h
Radius of base: r
Slant height: s
Lateral surface area: S
Total surface area: T
Volume: V
B = Pi r^{2}
s = sqrt[r^{2}+h^{2}]
S = Pi rs
T = Pi r(r+s)
V = Pi r^{2}h/3


(Learn how to build a cone
from paper or other flat material.)

Frustum of a Right Circular Cone
The part of a right circular cone between the base
and a plane parallel to the base
whose distance from the base is less than the height
of the cone.

Height: h
Radius of bases: r, R
Slant height: s
Lateral surface area: S
Total surface area: T
Volume: V
s = sqrt([Rr]^{2}+h^{2})
S = Pi(r+R)s
T = Pi(r[r+s]+R[R+s])
V = Pi(R^{2}+rR+r^{2})h/3 

(Learn how to build a frustum
from paper or other flat material.)

For more about cones, visit:
Ask Dr. Math:
Lateral Surface of a Cone
Volume of a Cone
Volume of a Cone
Volume and Surface Area of a Cone Frustum
The Geometry Center: Cones
