Problem: Using the formula fraction of the circle x circumference = arc length.Find length of minor arc AB.

The length of minor arc AB = 12.56 units.

Step-by-step explanation: The circle x has its circumference given as 2Pi x r.

A fraction of the circle is given as O/360,

Where O is the angle subtended at the center of the arc AB.

The length of an arc can be calculated by the formula;

Length of arc = O/360 x (2Pi x r)

Length of arc = 60/360 x (2 x 3.14 x 12)

Length of arc = 1/6 x (6.28 x 12)

Length of arc = 12.56 units.

Therefore the length of minor arc AB = 12.56 units