Question

what is the approximate surface area of the cone shown (use 3.14 for π.) with d 40in and height of 40in

Answer 1

Answer:

4064.5

Step-by-step explanation:

The formula for surface area of a cone is

$As=\pi r(r+\sqrt{h^2+r^2})$

r= radius

h= height

$\pi$=3.14 (in this instance)

*remember that radius =1/2 of a diameter AKA d

So our radius is:

r=20

our height is:

h=40

and $\pi$ is:

3.14

Lets use our formula now

$As=3.14(20)(20+\sqrt{40^2+20^2} )\\As=4064.50137973 or about 4064.5$