Which of the following triangles are congruent by the SSS Congruence Theorem? Enter the lesser number first.

To determine if any of the given triangles are congruent by the SSS (Side-Side-Side) Congruence Theorem, we must compare the lengths of the sides of the triangles.

1. **Triangle #1** has sides measuring 2.5 cm, 6.75 cm, and 8 cm.
2. **Triangle #2** has two sides measuring 2.5 cm and 8 cm, but we do not know the length of the third side as it is defined by the angle (60°) between them. Therefore, we cannot match it to Triangle #1.
3. **Triangle #3** has sides measuring 2.5 cm, 6.75 cm, and 8 cm, but it is given in a different configuration (with an angle), so it does not directly provide the necessary information based on the third side.

Now checking for potential congruence:

- **Triangle #1** has side lengths: 2.5 cm, 6.75 cm, 8 cm.
- **Triangle #3** has sides that include a side of length 8 cm alongside sides of 2.5 cm and 6.75 cm as well.

Since Triangle #3 also has the sides 2.5 cm, 6.75 cm, and 8 cm, we can say:

**Triangle #1 and Triangle #3 are congruent by the SSS Congruence Theorem.**

Thus, the answer is:

Triangle 1 and Triangle 3 are congruent.