Question

Why can't we use hand span, cubit, foot span etc. for measuring distance

Answer 1

Explanation:

Because they have no fixed value and they vary from person to person .So it is not accurate.

Answer 2

Answer:

We cannot use hand span, cubit, foot span etc for measuring distances because they vary from person to person and have no fixed value. This is because the distance between them is very large and millimetres are a very small unit of length and also there is no definite value or unit suitable for measurement for these units.