Not sure what a hacter is. It could be a hectare, in which case the following answer is appropriate:
There is no sensible answer to this question. A hectare is a measure of area, with dimensions [L2]. A centimetre is a measure of length, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
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1 in = 2.54 cm (exactly)
1 meter = 100 cm
How many A/cm is equal to 1 Gauss
Each inch is equal to 2.54 cm., so a cm. is equal to 1/2.54 inch.
1 cm = 10 mm18 cm = 180 mm