Question

What is the surface area of a cone that has a radius of 8 feet and a slant height of 12 feet? (Use 3.14 for π.)

301.44 ft 2
502.4 ft 2
200.96 ft 2
803.84 ft 2​

Answer 1

502.4

Explanation:

Answer 2

Surface area of cone is
`502.4\ ft^2`

Explanation:

Given:

radius of a cone (r) = 8 feet

slant height of cone (l) = 12 feet

We need to find the surface area of cone.

Total surface area of cone = Area of circle
`+` Area of curved surface

Now we know that,

Area of circle =
`\pi r^2`

Area of curved surface =
`\pi rl`

Hence Total surface area of cone =
`\pi r^2+\pi rl=\pi r(r+l) = 3.14 * 8 (8+12)=3.14*8*20= 502.4 \ ft^2`

Surface area of cone is
`502.4\ ft^2`.