Kay and her friend Amber like to collect stamps. Kay has six stamps and collects to my each week. Amber has 10 stamps and collects one more each week. These relationships are shown as rules equations below.

Acentral angle measuring 160 degrees intercepts an arc in a circle whose radius is 4. what is the length of the arc the circle formed by this central angle? round the length of the arc to the nearest hundredth of a unit. a) 4.19 units b) 6.28 units c) 12.57 units d) 12.57 square units