SOLUTION: kevin designs a sprinkler system for his yard. one rotation of the sprinkler waters a circle with an area of 225π square feet. What is the radius,r,of the circle the rotating

Algebra ->  Circles -> SOLUTION: kevin designs a sprinkler system for his yard. one rotation of the sprinkler waters a circle with an area of 225π square feet. What is the radius,r,of the circle the rotating       Log On


   

Question 252952: kevin designs a sprinkler system for his yard. one rotation of the sprinkler waters a circle with an area of 225π square feet. What is the radius,r,of the circle the rotating sprinkler waters?
Answer by drk(1908) About Me  (Show Source):
You can put this solution on YOUR website!
Area of circle has the formula:
A+=+pi%2Ar%5E2
Your area was given as 225pi, so we have
225%2Api+=+pi%2Ar%5E2
divide by pi to get
225+=+r%5E2
take a square root and we get
r+=+15+feet