an edge!
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Fold the fabric on the diagonal so that one side edge is on the top edge. If you then cut along the shortest vertical edge, and unfold, you now have the largest square possible.
The outer boundary of the square meter area - the "edge".
The cube has 6 faces. They all have the same area. If all 6 of them add up to54 square units, then each one has an area of 9 square units.The area of each face is the square of the length of an edge. If 9 square unitsis the square of the length of an edge, then the length of an edge is 3 units.
square
Eight.