No
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No.
No.
No, because it would then be considered a rectangle.
Parallelagram, Rhombus, Square, or Rectangle are the ones with congruent sides. There are also shapes like Trapezoids that do not have equal sides.
It depends on the trapezoids. You could get a rectangle or a square, or a variety of other shapes. I guess the maximum number of sides that you could obtain would be 8.