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m squared should be written as m followed by a superscript 2
m²
You want to write squre of is simply two power of m and this one write in mathematical form = m2.
http://www.tutorspoint.com/assignment_help/mathematics/what_is_mathematics.htm
It's usually represented by m2
If you can't do a superscript, I prefer to see m^2 to indicate an exponent, rather than m2.
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