The number is service upgrade sold by each of 30 employees is as follows :32,621,10,8,11,12,36,17,16,15,18,4 0,24,21,23,24,24,29,16,32,31,10,30, 35,32,18,39,12,20

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