The formula for the circumference of a circle is C = 2πr. The distance around the outside of a circular paved driveway is 38.88m. What is the radius of the driveway?

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters