Imagine the wire is straight, now cut through at right angle to the centre line,
the exposed surface is the cross sectional area, on a round wire it
= pi * radius2 (area of a circle)
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pi*radius^2 or since you'll most likely measure a diameter pi*(d/2)^2
A circle.
Area of cross section of wire= Pi X D2/4=3.14 X (0.0625)2/4=0.0031
The answer depends on the cross sectional area of the wire. This is not given.
(4 times the square root of 'A') centimeters.