The curved surface area of a frustum cone is calculated by using the formula,_____________.

π l (R - r)

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π l (R + r)

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π l (R \times r)

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2 π l (R + r)

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Solution

The correct option is B $π l (R + r)$
The curved surface area of a frustum cone is calculated by using the formula,
= $π l (r + R)$
where l = slant height of a cone
R = bottom circle radius
r = top circle radius

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