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If the slant height of the frustum of a cone is 10 cm and the perimeters of its circular base are 18cm and 28cm respectively.

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If the slant height of the frustum of a cone is 10 cm and the perimeters of its circular base are 18cm and 28cm respectively. What is the curved surface area of the frustum?

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Let r and ,R be the radii of the two circular ends of the frustum of the cone

Now, curved surface area of the frustum

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