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Consider this cone with the diameter measure of 17 inches.

what is the surface area of the cone?
sa = pir2 + pirl

a. 204pi in.2
b. 259.25pi in.2
c. 446.25pi in.2
d. 663pi in.2

the answer is b.

1 Answer

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Yes, you are correct! The surface area of a cone is given by the formula SA = πr² + πrl, where r is the radius of the base and l is the slant height of the cone. Since the diameter of the base is given as 17 inches, the radius r is half of that, or 8.5 inches. However, to calculate the surface area using the formula above, we also need to know the slant height l of the cone.

User Saed Nabil
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