# SOLUTION: I need to know how to calculate the surface area of a circular cone that has a radius of 3 and height of 7. I have tried it many times and I get stuck calculating the square root

Algebra ->  Algebra  -> Surface-area -> SOLUTION: I need to know how to calculate the surface area of a circular cone that has a radius of 3 and height of 7. I have tried it many times and I get stuck calculating the square root       Log On

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 Geometry: Area and Surface Area Solvers Lessons Answers archive Quiz In Depth

 Question 343369: I need to know how to calculate the surface area of a circular cone that has a radius of 3 and height of 7. I have tried it many times and I get stuck calculating the square root portion can you help me? Answer by stanbon(57307)   (Show Source): You can put this solution on YOUR website! I need to know how to calculate the surface area of a circular cone that has a radius of 3 and height of 7. -------------- surface area = pi*r^2 + prL where L is the slant height of the cone. --------------------------------- L = sqrt(3^2+7^2) = sqrt(58) = 7.62 ---- SA = (3.14)*3^2 + (3.14)*3*7.62 = 100 sq. units ================================================== Cheers, Stan H.