Explanation:
We need to measure three angles using a protractor. To do this correctly, remember:
- The protractor has two number scales: one going from 0° to 180° clockwise (outer scale), and one going from 0° to 180° counterclockwise (inner scale).
- Always place the center point of the protractor on the vertex of the angle.
- Align one side of the angle with the 0° line — then read the number where the other side crosses the scale.
Let’s go through each angle:
First angle (top):
- One ray points to the right (aligned with 0° on the *inner* scale — because the inner scale starts at 0 on the right).
- The other ray points upward-left, crossing the inner scale at
70°.
✔ So the angle is
70°.
Second angle (middle):
- One ray points to the right (again, aligned with 0° on the inner scale).
- The other ray points upward-left, but further left than before. It crosses the inner scale at
130°.
✔ So the angle is
130°.
Third angle (bottom):
- One ray points to the right (0° on inner scale).
- The other ray points upward-right, crossing the inner scale at
110°.
✔ So the angle is
110°.
Double-check:
- All angles open *counterclockwise* from the rightward ray, so we use the inner scale (0° on the right → increases leftward).
- 70°, 130°, and 110° all make sense visually and match standard protractor readings.
Final Answer:
70°, 130°, 110°
Parent Tip: Review the logic above to help your child master the concept of printable math worksheets measuring angles.
