Doubt about Electric Field calculations

[ft92]

Homework Statement

Find the magnitude of an electric field intensity at a distance 12.9 cm, from the axis of a long, straight conductor, which has a radius 3.82 cm, and a charge density of 1.61 C/m.

Homework Equations

Gauss's law

The Attempt at a Solution

E= λ/2πrε₀

Hello, I'm having some troubles understanding this question. To find E i would simply use the 12.9 cm radius, convert it into meters and use the above equation but if I do so I won't need the other information given of the radius of the conductor.
Do you agree with me? or should I add the 12.9 + the 3.82 radius and put that value into the equation?
thanks

 

[Orodruin]

The problem clearly states that the 12.9 cm distance is the distance from the axis. The 3.82 cm information is a red herring.

 

[ft92]

thank you!