Square millimeters.
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0.16 m2 = 160,000 mm2
cm2 = (10mm)2= 100 mm2.
It's not "maths". It's spelled "math". The mathematics is spelled with an "s" because it counts for all of the numbers used in a mathematical expression, and not just one mathematic note. When using British English the correct abbreviation is maths not math.
6370mm2
That depends upon the maximum amperage expected through the cable (which generally depends upon the usage): Lighting circuits use 1.0 mm2 or 1.5 mm2 Ring mains use 2.5 mm2 Cookers and showers use 6.0 mm2 If you are unsure, get a qualified electrician to install the cable you need (recommended).