Identifying Angles - Free Printable

Problem: Identifying Angles

The task is to identify the type of angle in each of the given diagrams. The options for classification are:
- Right Angle: An angle that measures exactly 90 degrees.
- Acute Angle: An angle that measures less than 90 degrees.
- Obtuse Angle: An angle that measures more than 90 degrees but less than 180 degrees.

Let's analyze each diagram step by step:

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#### Diagram 1
- The angle shown is less than 90 degrees.
- Classification: Acute Angle.

#### Diagram 2
- The angle shown is exactly 90 degrees (a square corner).
- Classification: Right Angle.

#### Diagram 3
- The angle shown is more than 90 degrees but less than 180 degrees.
- Classification: Obtuse Angle.

#### Diagram 4
- The angle shown is less than 90 degrees.
- Classification: Acute Angle.

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Final Answers:

1. Acute Angle
2. Right Angle
3. Obtuse Angle
4. Acute Angle

Boxed Final Answer:

\[
\boxed{\text{1. b, 2. a, 3. c, 4. b}}
\]