Question

Question #04486

Answer 1

Rounded to nearest foot `->314 " feet"^2`

Explanation:

Let the radius be `r`
Let the diameter be `d`
Let area be `a`

Known:
`a=pir^2`

Same equation in a different form

`r=d/2=> pir^2-> pi(d/2)^2 = pid^2/4`
'~~~~~~~~~~~~~~~~~~~~~~~~~~~

Given that `d=20 ft` we have

`a=pi(20^2)/4`

`a=314.159" feet"^2` to 3 decimal places

Rounded to nearest foot `314 " feet"^2`