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Question 70347: Hello,
Help! I need to find the surface area of a cone with a radius of 3in and a slant height of 5in.
Thank you
Answer by ganit(6)   (Show Source):
You can put this solution on YOUR website! For Cone
Lateral Surface Area = ( π * R) * [sqrt(R² + H²)]
Base Surface Area = π * R^2
Total Surface Area = Lateral SA + Base SA
here,
r=3 in, and slant height =5in which is same as [sqrt (r^2 + h^2) ]
Lateral surface area = π * 3)* 5 =(3.14 *3*5) sq in = 47.1 sq in
Base Surface Area = π *r^2
= 3.14 * 3*3
= 28.26 sq in
Total surface area= Lateral SA + Base SA
= 47.1 + 28.26
= 75.36 sq in
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