What Is Angle Measure ⭐ Definition, Protractor, Examples, Facts - Free Printable

Let's solve the "Classifying Angles" worksheet step by step.

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🔍 Understanding Angle Types:

Before we classify each angle, let’s review the definitions:

- Acute angle: Less than 90°
- Right angle: Exactly 90° (looks like a square corner)
- Obtuse angle: Greater than 90° but less than 180°

We’ll use these definitions to identify each angle in the grid.

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📐 Now, let’s go through each angle one by one:

#### Row 1:
1. First angle (top-left): The two lines form a sharp "V" shape — clearly less than 90° → ✔ Acute
2. Second: Looks like a perfect L-shape → ✔ Right
3. Third: Wide open, more than 90° → ✔ Obtuse
4. Fourth: Very narrow "V" → ✔ Acute

#### Row 2:
5. Fifth: Sharp "V", less than 90° → ✔ Acute
6. Sixth: Looks like a right angle (L-shaped) → ✔ Right
7. Seventh: Open wide, greater than 90° → ✔ Obtuse
8. Eighth: Narrow V → ✔ Acute

#### Row 3:
9. Ninth: Open angle, wider than 90° → ✔ Obtuse
10. Tenth: Looks like a bent line forming a wide angle → ✔ Obtuse
11. Eleventh: Narrow V → ✔ Acute
12. Twelfth: Perfect L-shape → ✔ Right

#### Row 4:
13. Thirteenth: Sharp "V" → ✔ Acute
14. Fourteenth: Looks like a right angle → ✔ Right
15. Fifteenth: Wide open → ✔ Obtuse
16. Sixteenth: Very narrow → ✔ Acute

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✔ Final Answers (in order):

| Angle | Classification |
|-------|----------------|
| 1 | Acute |
| 2 | Right |
| 3 | Obtuse |
| 4 | Acute |
| 5 | Acute |
| 6 | Right |
| 7 | Obtuse |
| 8 | Acute |
| 9 | Obtuse |
| 10 | Obtuse |
| 11 | Acute |
| 12 | Right |
| 13 | Acute |
| 14 | Right |
| 15 | Obtuse |
| 16 | Acute |

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📝 Instructions for Student:

For each box, circle the correct name:
👉 Circle "Acute", "Right", or "Obtuse" based on the angle shown.

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💡 Tips:

- Use your knowledge of common shapes: a corner of a rectangle is a right angle.
- If the angle looks smaller than that → acute
- If it looks larger → obtuse

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✔ Answer Key Summary (for grading):

```
Row 1: Acute, Right, Obtuse, Acute
Row 2: Acute, Right, Obtuse, Acute
Row 3: Obtuse, Obtuse, Acute, Right
Row 4: Acute, Right, Obtuse, Acute
```

Let me know if you'd like this formatted as a printable answer sheet!