Question

Which of the following formulas would find the surface area of a right cone where s is the slant height r is the radius, LA is the lateral area, and BA is the base area?

Check all that apply.

Answer 1

a and c

Explanation:

a p e x

Answer 2

Option A and Option C

Explanation:

The surface area of a cone can be calculated with this formula:

`SA=\pi r^2+\pi rs` (This matches with the option A)

Where
`\pi rl` is the lateral area of the cone (Being "s" the slant height) and
`\pi r^2` is the area of the base of the cone (which is a circle).

You know that BA the is the area of the base and LA the lateral area of the cone.

Then, substituting into the formula for calculate the surface area of a cone, you get:

`SA=BA+LA`

This matches with the option C