measuring resistivity of copper wire
In general, you use a power supply to run a known current through the wire, and measure the voltage drop using a voltmeter accurate to the mV level. Then you use Ohm's law to calculate the resistance. V = I * R. V is the voltage on the voltmeter, I is the current, and R is what you want to know. You probe with the voltmeter at the exact location where you want to know the resistance.

Note, copper is a good conductor, but its conductivity is fairly sensitive to temperature. If you run so much current through it that it warms up, the resistance will change. So best to measure reasonably quickly, then disconnect the power.

Further reading:
Four wire resistance measurement
https://www.allaboutcircuits.com/textbook/direct-current/chpt-8/kelvin-resistance-measurement/

Copper resistance temperature coefficient
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html
Basically, for every degree of temperature increase, the resistance increases by 0.4%. So if it is 1 Ohm at 25C, ti will be 1.004 Ohms at 26C, and so-on.

In this specific question, I have my doubts that the dimensions are correct. A cross section of 0.00214 m^2 would be a very large wire, around 52mm (2") in diameter. Measuring the resistance of such a wire would require a very large current to give rise to any appreciable voltage.