Answer:

1. The sides of a triangle are segments. In geometry, if two segments are congruent, then they have the same length or measure. In other words, congruent sides of a triangle have the same length.
2. If two triangles have the same size and shape they are called congruent triangles. If we flip, turn or rotate one of two congruent triangles they are still congruent. If the sides of two triangles are the same then the triangles must have the same angles and therefore must be congruent
3. Triangles can be flipped over with respect to the other. As long as they are otherwise identical, the triangles are still congruent

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