A circle with center A and radius three inches is tangent at to a circle with center B, as shown. If point B is on the small circle, what is the total perimeter of the shaded region? Express your answer in terms of pi.
P = 18pi
We are looking for total circumference (ie perimeter) of two circles, of radii 3 and 3/2 metres
=(3^2+(3/2)^2)Pi =9+9/4=45/4 Pi= 11.25Pi