length times width
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The dimensions for area are [L2]
You can't tell the dimensions of a rectangle from its area, or the dimensions of a prism from its volume.
a rectangle has a perimeter of 72m. If the length is 20 m longer than the width find its dimensions?
The dimensions are W and W+M where W is the width.
The dimensions are 10 m by 6.5 m and so 10*6.5 = 65 square m