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Surface Area of a Frustum

The radii of ...

Question

The radii of the ends of a frustum of a cone of slant height $l$ are $r_{1}$ and $r_{2}$ . The curved surface area of the frustum of the cone is

2 π l (r_{1} + r_{2})

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π l (r_{1} + r_{2})

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π l (r_{1}^{2} + r_{2}^{2})

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π l (r_{1} - r_{2})

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Solution

The correct option is B $π l (r_{1} + r_{2})$

Radii of the ends of the frustum are $r_{1}$ and $r_{2}$ .

Curved surface area of frustum of cone $= π (r_{1} + r_{2}) l .$

Hence, the correct answer is option (b).

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