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There are infinite amounts of quadrilaterals that have sides that aren't all equal. In regular quadrilaterals, however there are rectangles and kites that have uneven lengths of sides.
In regular quadrilaterals, it's length times width.
There are always 2 diagonals in any quadrilateral whether or not it is irregular or regular
An equilateral parallelopiped, each of whose face is a rhombus.
Assuming you have a regular hexagon, drawing a line between every other vertex and the center will give you three congruent quadrilaterals (that also happen to be parallelograms... in fact, they are rhombuses).