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The curved surface area of frustum of a...

The curved surface area of frustum of a cone is `pi//(r_(1) +r_(2))`, where `l = sqrt(h^(2) +(r_(1) + r_(2))^(2)),r_(1) and r_(2)` are the radii of two ends of the frustum and h s the vertical height.

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We know that, if `r_(1)` and `r_(2)` are the radii of the two ends of the frustum and h is the vertical height, then curved surface area of a frustum is `pi //(r_(1) + r_(2))`, where `l = sqrt(h^(2) +(r_(1) + r_(2)))`.
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