Question

The net of a cone is shown below. What is the surface area of the cone rounded to the nearest tenth of a square inch? Use π = 3.14.

Answer 1

In order to find the surface area of a cone we can use the next formula

`SA=\pi r\mleft(r+l\mright)`

where r is the radius and l is the slant height

In our case

r=4 units

l=10 units

pi=3.14

`SA=(3.14)(4)(4+10)=175.8\text{ in}^2`

The surface area of the cone rounded to the nearest tenth is 175.8 in^2, therefore the correct choice is D.