4th Grade Geometry - Free Printable

Let's solve the Angle Classification 1 worksheet step by step.

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🔍 Understanding the Definitions:

From the top of the worksheet, we have:

| Type | Description |
|-----------|-----------------------|
| Acute | Less than 90° |
| Obtuse | Greater than 90° but less than 180° |
| Right | Exactly 90° |
| Straight | Exactly 180° |
| Reflex | Greater than 180° |

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

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✔ Now, let’s go through each of the 9 angles shown:

#### 1. First Row, First Column
- The angle looks like a perfect L-shape.
- This is exactly 90°.
- ✔ Answer: Right

#### 2. First Row, Second Column
- The angle is smaller than 90°, forming a narrow "V".
- It's clearly less than 90°.
- ✔ Answer: Acute

#### 3. First Row, Third Column
- The angle is greater than 90° but less than 180° — it opens wider than a right angle but not fully straight.
- ✔ Answer: Obtuse

#### 4. Second Row, First Column
- The angle is greater than 180° — it goes around more than half a circle.
- The arc shows the larger part of the angle.
- ✔ Answer: Reflex

#### 5. Second Row, Second Column
- This is another perfect L-shape, forming a square corner.
- ✔ Answer: Right

#### 6. Second Row, Third Column
- This is less than 90°, forming a sharp "V".
- ✔ Answer: Acute

#### 7. Third Row, First Column
- The angle is greater than 180°, as the arc spans more than a straight line.
- ✔ Answer: Reflex

#### 8. Third Row, Second Column
- The angle appears to be greater than 90°, but less than 180°.
- It’s an open angle, not too wide.
- ✔ Answer: Obtuse

#### 9. Third Row, Third Column
- The angle is greater than 180° — the arc is large and wraps around past a straight line.
- ✔ Answer: Reflex

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✔ Final Answers (in order):

| Angle | Classification |
|-------|----------------|
| 1 | Right |
| 2 | Acute |
| 3 | Obtuse |
| 4 | Reflex |
| 5 | Right |
| 6 | Acute |
| 7 | Reflex |
| 8 | Obtuse |
| 9 | Reflex |

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📝 Summary:

- Right: 2 angles (positions 1 & 5)
- Acute: 2 angles (positions 2 & 6)
- Obtuse: 2 angles (positions 3 & 8)
- Reflex: 3 angles (positions 4, 7, 9)

You can now fill in the blanks on the worksheet accordingly!

Let me know if you'd like a printable version or help with any other math problems! 😊