Circles are congruent when they have the same radius and they are similar when their radii are different in lengths.
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They can b different sizes
Sometimes similar but it depends
It is sometimes true that two parallelograms are similar. The could be congruent, or dissimilar in that one is not an enlargement of the other.
Always because they have to be 90 degrees, but it could be sometimes I guess if you factor in their different sizes.
Sometimes * * * * * Never. A parallelogram has two pairs of equal angles opposite one another. A trapezoid does not.