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

4064.5

Explanation:

The formula for surface area of a cone is

`As=\pi r(r+√(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+√(40^2+20^2) )\\As=4064.50137973 or about 4064.5`