Question

What is the surface area of the cone? (Use 3.14 for π.)

Answer 1

To solve this problem you must apply the proccedure shown below:

1. You must apply the formula for calculate the surface area of a cone, which is:

`SA=\pi r^(2) +\pi rl`

Where
`r` is the radius (
`r=7cm`) and
`l` is the slant height (
`l=12cm`) and
`\pi =3.14`

2. You need to substitute these values into the formula:

`SA=(3.14) (7cm)^(2) +(3.14)(7cm)(12cm)\\ SA=417.62cm^(2)`

Therefore, the answer is the last option:
`417.62cm^(2)`