Question

50 POINTS AND BRAINLIEST!!! QUICK

3. 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.

Answer 1

A)

R = outside radius
r = inside radius

equation: ( pi*R^2) - (pi*r^2)

B)
 3.14 x 11^2 - 3.14 x 9^2

379.94 - 254.34 = 125.6 square meters

Answer 2

A = pi r^2  pi 9^2 81pi  81 * 3.14 = 254.34   pi 11^2 = 121pi   121 * 3.14 =379.94
379.94 - 254.34 = 125.60 area of sidewalk

Hope it helps