Question 896389
You have the correct formula.  Substitute what is known and solve for what is unknown (or for what is asked).  Use the algebra that comes along with already-learned arithmetic skills.


The "rotates 360 degrees..." just means that the circle's interior is all sprinkled with water, meaning the entire area is water-sprinkled.


This is meaningful:  {{{highlight_green(A= 3.14r^2)}}}
This is <b>nonsense</b>:   {{{2000=3.24(360)^2}}}