The lateral area of the frustum of a right circular cone is calculated by using which formula?

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π (R + r) l

π (R - r) l

\frac{π}{2} (R + r) l

\frac{π}{2} (R - r) l

answer is A.

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Detailed Solution

It is given lateral area of the frustum of a right circular cone.
The lateral area of the frustum of a right circular cone is equal to one-half of the sum of the circumferences of the bases multiplied by slant height.
Therefore, lateral area

= \frac{1}{2} (2 πR + 2 πr) l

\Rightarrow (πR + πr) l

\Rightarrow π (R + r) l

Hence, the correct option is 1.

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