Tag Archives: right triangle

SAT Question of the Day Explained – October 25, 2014 – Math

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.

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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