Two lines intersect in more than one point.

a. always
b. sometimes
c. never

Lines' equations have a degree of only one. This means, when two lines are given, there are two equations and two unknowns. This means by degrees of freedom, the solution comprising of the x and y component is only one. Hence the answer should be C. never  

18.84956

Step-by-step explanation:

C=2(3.1415)(r)

d=6

6/2=3

r=3

C= 2(3.1415)(3)