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Example:Find Curved Surface Area of Frustum of a Cone

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Explanation:

In geometry, a frustum (plural: frusta or frustums) is the portion of a solid (normally a cone or pyramid) that lies between two parallel planes cutting it.

The term is commonly used in computer graphics to describe the three-dimensional region which is visible on the screen, the 'viewing frustum', which is formed by a clipped pyramid; in particular, frustum culling is a method of hidden surface determination.

In the aerospace industry, frustum is the common term for the fairing between two stages of a multistage rocket (such as the Saturn V), which is shaped like a truncated cone.

### Surface area

The surface area of a right circular cone frustum is

http://en.wikipedia.org/wiki/Frustum

(Our solved example in mathguru.com uses the below concept. This is our own explanation, it is not taken from Wikipedia.)

Curved surface area of frustum of a cone is given by

A =l (r1 + r2)

Where

l is the slant height

r1 and r2 are radii of 2 circular ends