It is a 4 sided quadrilateral
It has 2 pairs of opposite parallel sides
It has 4 equal interior right angles that add up to 360 degrees
It has 2 diagonals
It has 2 lines of symmetry
It will tessellate leaving no gaps or overlaps
It has a perimeter which is the sum of its 4 sides
It has an area which is length times width
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crossed rectangle is not a rectangle, rectangle have to have 90 degree angles.
It is an attribute that does not occur in some candidate key.
A composite attribute has multiple components, each of which is atomic or composite.
Prime attribute are part of any candidate key. Non-prime attribute are not part of any candidate key.
Every rectangle must have corners otherwise it would not be a rectangle!Every rectangle must have corners otherwise it would not be a rectangle!Every rectangle must have corners otherwise it would not be a rectangle!Every rectangle must have corners otherwise it would not be a rectangle!