Given :
for the triangle ABC and triangle DEF
the sides AB = DE, BC = EF and AC = DF are corresponding sides of equal length.
We will check the statements :
1. They are not congruent triangles. False
2. They are similar but not congruent triangles. False
3. They are neither similar nor congruent triangles. False
4. They are congruent triangles, True
They are congruent by SSS ( side - side - side ) because given the corresponding sides of equal length.