Nothing.
A squared metre is a measure of area. A kilogram is a measure of mass. The two measure entirely different things and it makes no sense at all to try to convert from one to the other.
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Meters per second squared I think thank you
As squared meters are two-dimensional and cm are one- dimensional it is not possible. If you meant cm squared then: 1 Meter squared = 10000 Centimeter squared. Using this you can use simple multiplication to convert.
1 ha = 10000 m2 ⇒ 1.56 ha = 1.56 x 10000 m2 = 15600 m2
1 ha = 10000 m2 ⇒ 3 ha = 30000 m2
That's the unit of force called one "Newton".