Question

Surface area of a cone. Can someone please explain?​

Answer 1

H. 163.3

Explanation:

The formula for the surface area of a cone is πrl(area of the side) + π
`r^(2)`(area of the base), where l is the slant height and r is the radius. We know that the radius is 4 and the slant height is 9, so we plug it into the equation to get π(4)(9) +
`\pi r^(2)` = 36π+16π = 52π which rounds to 163.3.