GOING AROUND IN CIRCLES
'(<a href="http://www.j-archive.com/media/2007-01-29_J_13.jpg" target="_blank">Cheryl of the Clue Crew shows a diagram of a circle on the monitor with arc AB, angle a between them, and the formula l(A,B)=ra.</a>)  In the formula <a href="http://www.j-archive.com/media/2007-01-29_J_13.jpg" target="_blank">here</a>, the length of arc (A,B) equals the angle a times r, which stands for this measurement'
radius