Question

Look at atachment

Answer 1

area of shaded=area of large circle-area of small circle

are of large circle=pi*R^2=pi(18)^2=324pi

area of small circle=area of large circle-areae shaded
pi*r^2=324pi-150pi
pi*r^2=174pi
r^2=174
r=13.9

Answer 2

Thankyou that helped a lot

Answer 3

:)