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Frustum of a Cone
When we cut a right circular cone with a plane parallel to the base of the cone, then the solid shape between the plane and the base of the cone is called the frustum of a cone.
Flower pots have a shape as the frustum of a cone.
The surface area and the volume of the frustum of a cone can be calculated using standard formulae.
CSA of the frustum of a cone = 
1
2
where
r1 = radius of the larger circular face of the frustum,
r2 = radius of the smaller circular face of the frustum, and
l = slant height of the frustum.
h is the height of the frustum.
TSA of a frustum of a cone = πl(r1 + r2) + πr12 + πr22
Volume of the frustum of a cone = (1/3) πh (r12 + r22 + r1 r2)
CSA of the frustum of a cone = 
1
2
TSA of a frustum of a cone = πl(r1 + r2) + πr12 + πr22
Volume of the frustum of a cone = (1/3) πh (r12 + r22 + r1 r2)
