Question

Find the surface area of the cone in terms of pi. SA=__ cm squared. simply

Answer 1

Given the figure of a cone.

As shown, the slant height = s = 23 cm

And the diameter of the base = d = 18 cm

So, the radius = r = 0.5d = 9 cm

The surface area of the cone will be calculated using the following formula:

`SA=\pi rs+\pi r^2`

Substitute s = 23, and r = 9, writing the surface area in terms of π

`SA=π(18)(23)+π(9)^2=414π+81π=495π`

So, the answer will be:

The surface area of the cone = 495π cm²