Aline that is tangent to a circle must intersect the circle at
a. exactly one point
b. exactly two points
c. exactly three points
d. none of the above

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