(A) Find the average rate of change of the area of a circle with respect to its radius $r$ as $r$ changes from

(i) 2 to 3 $\rightarrow$ Average rate of change =

(ii) 2 to 2.5 $\rightarrow$ Average rate of change =

(iii) 2 to 2.1 $\rightarrow$ Average rate of change =

(B) Find the instantaneous rate of change when $r$ = 2 .
Instantaneous rate of change =