SOLUTION: What is the surface area of a cone with radius 6 inches and a slant height of 9 inches. Thank you!

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Question 1036891: What is the surface area of a cone with radius 6 inches and a slant height of 9 inches.
Thank you!
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
A+pi*r(r+ sqrt(h^2+r^2)); h^2+r^2=L^2, where L is the slant height. Therefore, A+pi*r(r+L)
A=pi*6(6+sqrt(81))=6*pi(15)=90 pi in^2.