SOLUTION: what is the surface area of a right cone whose base diameter is 40 cm and whose slant height is 21 cm? Round your answer to the nearest tenth

Question 832347: what is the surface area of a right cone whose base diameter is 40 cm and whose slant height is 21 cm? Round your answer to the nearest tenth
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
what is the surface area of a right cone whose base diameter is 40 cm and whose slant height is 21 cm? Round your answer to the nearest tenth
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A = pi*r*(slant height) + pi*r^2
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A = pi[20*21+20^2] = 2576.1 cm^2
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Cheers,
Stan H.
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