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Write the formula to find the total surface area of a frustum of a cone.
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Answer: Total surface area of a conical frustum: A = π * (r12 + r22 + (r1 + r2) * s) = π * [ r12 + r22 + (r1 + r2) * √((r1 - r2)2 + h2) ]
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This is the asnwer for your question where
l=√h^2+(r-r') ^2
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