It depends on the size of the shoe. Male, female and children have different sizes.
For instance, a UK male size of 8 is a 9 in the USA.
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It is exactly equal to the length of string you have measured in centimeters.
There is no line specified. The ideal line, in geometry, is of infinite length.
42 cm
Many options exist. You might measure the length in inches or centimeters. A better choice might be "shoe size".
Pens vary considerably in size so there is no simple answer.
The meter - or some fraction of it, such as decimeter, centimeter or millimeter. In actual practice, centimeter is quite common for an object of that size.
160.308cm to the nearest whole centimeter is 160cm
Musical instrument strings: 4/4 Violin 32.7 to 33.0 cm Double bass 105.0 to 110.0 cm
what unit would you the length of a shoe? mm,cm,dm,m, or km.
A Centimeter
It is already rounded to the nearest tenth of a centimeter.