Triangles that are the same shape but not the same size. In order to be a similar triangle, their numbers have to form proportions with the numbers of the similar triangle.
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Two triangles are similar if the angles of one are equal to the [corresponding] angles of the other. This implies ratio of their corresponding sides is a constant.
why triangle are similar
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.