Question

guys can anyone answer this questions​

Answer 1

area of inner circle =22/7×r^2

=22/7×21^2=22×3^2

198cm^2

area of outer circal=22/7×42^2

22×6^2

792cm^2

outer circle-inner circle

792cm^2-198cm^2

594cm^2

sorry I know only this much