why triangle are similar
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Not always, sometimes two obtuse triangles are similar and sometimes they are not similar.
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The triangles are similar, but not necessarily congruent.
Yes, similar triangles are congruent because in order to be congruent they must first be equal. Which in turn is the definition of a similar triangle. A triangle equal in angle measurements and/or side lengths. So, yes.
90 degree triangles are always similar.