Upgrade subject to access all content
Created for Albert.io. Copyright 2016. All rights reserved.
Circle $O$ is circumscribed about square $ABCD$. If $BC=8$, then what is the area of the shaded sector bounded by points $A,B$, and $O$, as shown in the figure above?
$ 4\pi $
$ 8\pi $
$ 16\pi $
$ 24\pi $