1) On a flywheel with a 62.1-mm radius, how long is an arc subtended by a central angle?

2) Two wheels are rotating in such a way that the rotation of the smaller wheel causes the larger wheel to rate. The radius of the smaller wheel is 7.2 centimeters and the radius of the larger wheel is 21.5 centimeters. Through how many degrees will the larger wheel rotate if the smaller one rotates 131 degrees? 

3) The minute hand of a clock is 13 inches long. What distance does its tip move in 20 minutes?