Two rectangles are seldom but sometimes similar.
They can be but they don't have to.
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they are sometimes similar because their angles are 90 degrees therefore their angles are proportianite
If two rectangles are similar, they have corresponding sides and corresponding angles. Corresponding sides must have the same ratio.
Similar shapes need to have the same number of sides, the same angles and the ratio of the sides needs to be the same. Rectangles are not always similar to each other because they can have different dimensions, which would break the "same ratio" rule.
No. Although squares are always rectangles, rectangles are not always squares. A square has four sides of equal length and four right angles. Rectangles must only have four right angles.
Not always, sometimes two obtuse triangles are similar and sometimes they are not similar.