they are sometimes similar because their angles are 90 degrees therefore their angles are proportianite
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Two rectangles are seldom but sometimes similar. They can be but they don't have to.
Not always, sometimes two obtuse triangles are similar and sometimes they are not similar.
If two rectangles are similar, they have corresponding sides and corresponding angles. Corresponding sides must have the same ratio.
always
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.