2d is 2 dimensional so there is only length and width... edges are only in 3d and 2d figures only have one side...
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An octagon, (2D) has one face, zero edges, and eight sides.
They are both the same, A cube and a cuboid both have 6 sides, 6 faces and 12 edges
2d rectangle has 4 sides.
Four.And a rectangle can only be 2d.
A triangle as no other 2d shape can have 3 sides.