Which of the following arcs is longer?

Question

NR
NRS
NST
NP

Also can you explain what an arc is? Thank You!

Answer 1

http://www.mathsisfun.com/definitions/arc.html

Answer 2

Its C.

Answer 3

1: D
2: A
3: D
4: A
5: C
I got 100% if you are with Connexus!

Answer 4

I also got 100% Connexus: Geometry: Circles!!!