PLZZ ASAP THIS IS MY LAST QUESTION ON THE QUIZ
At a zoo, the lion pen has a ring-shaped sidewalk around it. The outer edge of the sidewalk is a circle with a radius of 11 m. The inner edge of the sidewalk is a circle with a radius of 9 m. (a) Write and simplify an expression for the exact area of the sidewalk. (b) Find the approximate area of the sidewalk. Use 3.14 to approximate π.
