That would refer to the cross-section. A wire that has twice the diameter of another wire would have 4 times the cross-section - and therefore 4 times as much weight per meter, and 4 times as much current-carrying capacity.
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AO paper measures 1189 x 841 mm. Area size therefore 999,949 square mm
300 mm square = 300 mm * 300 mm = 300*300 square mm = 90000 sq mm or 90000 mm2
10,000 mm square
Find the wire from the secondary of the transformer. If it's a step-down transformer the thicker wire is the secondary. Measure its diameter in inches and calculate its cross-section area in square inches. The current rating for transformer wire is 1000 amps per square inch, or 1.55 amps per square mm.
5.3 square meters = 5,300,000 square mm