Identify triangle types by their angles in this educational worksheet.

To solve the problem, we need to identify each triangle as acute, obtuse, or right based on the angles in the triangles. Let's go through each triangle step by step:

Definitions:

1. Acute Triangle: All three angles are less than 90°.
2. Right Triangle: One angle is exactly 90°.
3. Obtuse Triangle: One angle is greater than 90°.

Step-by-Step Analysis:

#### Triangle 1:
- The triangle has all angles less than 90°.
- Classification: Acute

#### Triangle 2:
- The triangle has one angle that is exactly 90° (indicated by the square symbol).
- Classification: Right

#### Triangle 3:
- The triangle has one angle greater than 90°.
- Classification: Obtuse

#### Triangle 4:
- The triangle has all angles less than 90°.
- Classification: Acute

#### Triangle 5:
- The triangle has one angle that is exactly 90° (indicated by the square symbol).
- Classification: Right

#### Triangle 6:
- The triangle has all angles less than 90°.
- Classification: Acute

#### Triangle 7:
- The triangle has one angle that is exactly 90° (indicated by the square symbol).
- Classification: Right

#### Triangle 8:
- The triangle has one angle greater than 90°.
- Classification: Obtuse

Final Answer:

```
1. Acute
2. Right
3. Obtuse
4. Acute
5. Right
6. Acute
7. Right
8. Obtuse
```

Thus, the completed worksheet would look like this:

| Triangle | Classification |
|----------|----------------|
| 1 | Acute |
| 2 | Right |
| 3 | Obtuse |
| 4 | Acute |
| 5 | Right |
| 6 | Acute |
| 7 | Right |
| 8 | Obtuse |

$$
\boxed{\text{Acute, Right, Obtuse, Acute, Right, Acute, Right, Obtuse}}
$$