Giving the circle with 2 radius
Radius 1= 12
Radius 2=10
this figure is also known as a ring
the area of the ring is given by
[tex]A=\pi r1^2-\pi r2^2[/tex]
this is just the difference of the area of the bigger circle less the smaller circle
then
[tex]A=\pi(r1^2-r2^2)[/tex][tex]A=\pi(12^2-10^2)[/tex][tex]A=\pi(44)[/tex][tex]A=44\pi=138.230[/tex]
