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The image shows 8 inch, 9 inch and 7 inch

Claire says that in order to calculate the surface area of the cone, she needs to use 8 in. Miles says that in order to calculate the surface area of the cone, he needs to use 9 in. Who is correct and why?

(1 point)
Responses

Miles is correct because 9 in. is the slant height of the cone.
Miles is correct because 9 in. is the slant height of the cone.

Claire is correct because 8 in. is the height of the cone.
Claire is correct because 8 in. is the height of the cone.

Miles is correct because 9 in. is the height of the cone.
Miles is correct because 9 in. is the height of the cone.

Claire is correct because 8 in. is the slant height of the cone.

Miles is correct because 9 in. is the slant height of the cone. The surface area of a cone is calculated using the formula A = πr(r + √(r^2 + h^2)), where r is the radius and h is the height. The slant height is needed to calculate the surface area, not the height.