Hi pls its due at 12 and its 11: 45 will mark brainliest

Answer = 3.14 * 40 = 125.6m^2

Step-by-step explanation:

Let R be the greater radius and r be the smaller radius

A) Area of the sidewalk =  \pi R^2 -  \pi r^2   - This can be the expression

B)  pi  = 3.14  

= pi (R^2-r^2)

= pi (11^2-9^2)

= pi (121-81)

= pi *40

That was the simplified expression

Answer = 3.14 * 40 = 125.6m^2

c

step-by-step explanation: