There cannot be a 12m rectangle. A rectangle is a two dimensional object and so there must be two linear measures to describe it.
Either there is measure of another length, for example a 12m x 8m rectangle. In that case the question is redundant.
Or the 12m is intended as a measure of area and should actually have been 12 SQUARE metres. However, in that case, there are infinitely many possible solutions.
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i think that it si 4x3 and it eqals 12
12m
me
It has 2 dimensions which are length and width
They are also known as the "dimensions" of a rectangle.