A2 width means a double narrow. A is a regular narrow A2 is double narrow and A3 is triple narrow. These are also just referred to as A, double A or triple A.
a double size
a double size
Get Stuffed
M means medium, and is a reference to the width of the shoe, not the actual size.
'D' and/or 'M' is the shoe size width measurement, and indicates a medium or standard width. Sometimes the shoe width size will be indicated with only a 'D' or 'M.' Furthermore, a 'C' width would be narrow width, an 'E' width indicates a wide width, and an 'EE' width would be extra-wide. If you're seeking detailed information on the exact width measurements, measured in inches, there should be some U.S. shoe size width charts available on the internet, found using the keywords, "US shoe size width chart."
A2 has double the area of A3, with a width equal to the length of A3 and a length equal to double the width of A3
If by that you mean knowing only the diagonal and the width, then by the formula a2+b2=c2, where a is the length, b the width and c the diagonal. To find the width b, you need to calculate sqrt(c2-a2). For example, the width of a rectangle with length 3 and diameter 5 is sqrt(52-32)=4
42cm 60cm
Narrow.
YAY! (=
When you go to shoe store, they have this feet measurement. It measures both your shoe length and width.