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A sheet of A4 paper measures 29.7 centimetres in length and 21.0 centimetres in width. A third of this length would be 9.9 centimetres in length and 7 centimetres in width.
Length and width define two dimensions, like a piece of paper has a length distance measure along one side and a width distance measure on the other side. In three dimensions there is length and width and height, like a solid brick or block
A piece of paper has a length and a width. Though extremely small, the paper has a thickness, giving the paper 3D.
67mm wide ; 155 mm long
perimeter = length + length + width + width = 2*length + 2*width = 36 length = 5*width 2*(5*width) + 2*width = 36 12*width = 36 width = 3 length = 15