Length of wire due to resistance

[Danny_b_2011]

Homework Statement

What length of copper wire, 0.462 mm in diameter, has a resistance of 1.00 (omega)?

Homework Equations

R=rho*L/A

The Attempt at a Solution

I tried it using this formula and the rho = 1.7e-8 but it didnt work and gave me the wrong answer can someone help?

 

[uart]

What answer did you get and how do you know it's wrong?

 

[Jaynte]

L = R*A/rho = 1*pi*r^2/(1.7e-8)

did you use this formula?
is rho = 1.7e-8 for copper?
did you use r=0.231e-3 [m]?