No rectangle can have 6 sides. Rectangles by definition have 4 sides.
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A 6-sided rectangular solid, on the other hand, has... let's see, could it be six?
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6 edges
It has 12 edges, 6 faces and 8 vertices
6
A cube has 12 edges. A 4-sided pyramid has 8 edges. A 3-sided pyramid has 6 edges. There are also other pyramids with more sides.
A pyramid with an n-sided base will have n + 1 vertices, n + 1 faces, and 2n edges. 6 edges