Today’s SAT question of the day is a fun math question that reviews some geometry basics.  You’ll definitely need those basics for your test, so let’s give this one a try.

We are told that the radius of circle O is 5 and that the area of the shaded region is 20pi. X is what we are seeking.

Since the area of a circle is pi * the radius squared, we know that the whole circle’s area is 25pi. Let’s also remember that there are 360 degrees in a circle. Continue reading →