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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.
i think that it si 4x3 and it eqals 12
12m
The perimeter of a rectangle is the distance all the way round it.That's lenght (4.5m) + a breadth (1.5m) + another length (4.5m) + another breadth (1.5m) = 12m.Algebraically, the perimeter is 2(l + b), where l is the length and b is the breadth, = 2 x (4.5m + 1.5m) = 2 x 6m = 12m.
This length (diagonal) = sq.rt ( l2 + b2 ) where 'l' is length of the rectangle and 'b' is the breadth of the rectangle.