Not the exact same, one has proportionally larger sides than the other. Angles in both are the same.
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It is similar
two geometrical object are called similar if they both have the same shape, or one has the same shape as the mirror image of the other
An equilaterial triangle is always similar, because the corresponding angles are conqruent, it has the same basic shape, and it has a scale factor.
No. For example the triangles with sides {3, 4, 5} and {6, 8, 10} are similar but not congruent.
Three sided polygons would be triangles. Triangles that have the same shape (same angle measures) but are different sizes (different side lengths) would be called similar triangles. In similar triangles, corresponding sides have lengths in the same ratio. If triangle ABC is similar to triangle DEF, then: AB/DE = BC/EF = AC/DF.