Upgrade to access all content for this subject

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?

(No Calculator)

$ 4\pi $

$ 8\pi $

$ 16\pi $

$ 24\pi $