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Each side of any one triangle must be congruent to one side of each of the other three triangles.
Side Side Side when comparing two triangles the side side side postulate states that if three sides from one triangle are congruent to three sides on another triangle the triangles are conguent
You could prove two triangles are congruent by measuring each side of both triangles, and all three angles of each triangle. If the lengths of the sides are the same, and so are the angles, then the triangles are congruent... if not, then the triangles are not congruent. If the triangles have the exact same size and shape then they are 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.
depends on the side of the triangles?