4.MD.6 Measuring angles with a protractor worksheet - Free Printable

To solve the problem, we need to measure each angle using a protractor. Here's a step-by-step explanation for each angle:

Step 1: Understand the Protractor

- A protractor is a semicircular tool used to measure angles.
- The center of the protractor is marked, and it has two scales (inner and outer) that go from 0° to 180°.
- To measure an angle:
1. Place the center of the protractor at the vertex of the angle.
2. Align one side of the angle with the baseline of the protractor (the straight edge).
3. Read the angle measurement where the other side of the angle intersects the protractor scale.

Step 2: Measure Each Angle

#### Angle 1:
- The angle is measured on the inner scale.
- The baseline is aligned with the 0° mark.
- The other side of the angle intersects the protractor at 40°.
- Measurement: 40°

#### Angle 2:
- The angle is measured on the outer scale.
- The baseline is aligned with the 0° mark.
- The other side of the angle intersects the protractor at 70°.
- Measurement: 70°

#### Angle 3:
- The angle is measured on the inner scale.
- The baseline is aligned with the 0° mark.
- The other side of the angle intersects the protractor at 90°.
- Measurement: 90°

#### Angle 4:
- The angle is measured on the outer scale.
- The baseline is aligned with the 0° mark.
- The other side of the angle intersects the protractor at 120°.
- Measurement: 120°

#### Angle 5:
- The angle is measured on the inner scale.
- The baseline is aligned with the 0° mark.
- The other side of the angle intersects the protractor at 140°.
- Measurement: 140°

Step 3: Write Down the Measurements

- Angle 1: 40°
- Angle 2: 70°
- Angle 3: 90°
- Angle 4: 120°
- Angle 5: 140°

Final Answer:

\[
\boxed{40^\circ, 70^\circ, 90^\circ, 120^\circ, 140^\circ}
\]