How to find the radius of copper wire given resistivity values

[subopolois]

Homework Statement

i need to find the radius of a copper wire given the following data:
resistivity is 0.25 ohm meter
length of wire is 200 m

Homework Equations

roe=RS/I
roe=resistivity
R= resistance of material
S=cross sectional area
I= length of specimen

The Attempt at a Solution

i was looking at the equation and noticed i don't have any value for the resistance of the copper, so i looked it up online and it said: 0.00000001678 ohm.m. since i have 200m of wire i multiplied it by 200. so into the equation with everything:
0.25=3.356x10^-6 x s/200 meters
rearranging for the cross section area:
s= 21222410.9
although it doesn't say in the question, i assume that the cross section area of copper wire is circular. so i use the area of a circle to find the radius:
A= pi r^2
r= 2599 m

i don't know about you but this doesn't seem right, to have a wire with radius of 2.5 kilometers. I am stuck at what to do, my only guess is that the resistance value is wrong and i know there is and equation for resistance:
resistance= resistivity x length/area
i have the resisivity and the length, but what would i use for area?
help!

 

[Dick]

Yeah, 2.5 km for a radius doesn't make much sense. Neither does the question. The resistivity of copper is not 0.25 ohm*m. It's not even close. And if they give you the bulk resistivity and the length, that's just data, it's not a question. You can't determine radius from that. Can you post the question verbatim?