Let's solve this step-by-step. The task is to
match each angle shown on the protractor with its correct degree measurement from the given options.
We’ll go through each numbered diagram (1 to 5), determine the angle, and match it with the correct degree value from the list:
45°, 36°, 119°, 70°, 140°
---
🔍 How to Read a Protractor:
- Place the protractor so that the
center point (usually marked with a small hole or dot) is over the
vertex of the angle.
- Align one ray of the angle with the
baseline of the protractor (the straight edge).
- Look at where the other ray crosses the protractor scale.
- Use the
correct scale:
- If the angle opens to the
right, use the
outer scale (clockwise).
- If it opens to the
left, use the
inner scale (counterclockwise).
But in these diagrams, the
zero line is aligned with the baseline, and we just need to read where the second ray intersects the scale.
Let’s analyze each:
---
✔ 1)
- The angle starts at
0° on the left side (left zero).
- The second ray points to
45° on the
upper scale.
- This is a
45° angle.
- ✔️ Match with
45°
---
✔ 2)
- One ray is along the
0° right side (on the right).
- The other ray goes upward and points to
36° on the
top scale.
- Since the angle opens to the
left, we use the
inner scale starting from the right.
- But here, it's clearly pointing to
36°.
- ✔️ Match with
36°
> Note: Some might confuse the direction, but since the baseline is on the right, and the angle opens counterclockwise, we use the inner scale. The reading is
36°.
---
✔ 3)
- One ray is on the
0° right side.
- The other ray points to
119° on the
top scale.
- It's an obtuse angle, opening to the left.
- The second ray passes 90° and stops at
119°.
- ✔️ Match with
119°
---
✔ 4)
- One ray is on the
0° left side.
- The second ray points to
70° on the upper scale.
- This is an acute angle, opening to the right.
- ✔️ Match with
70°
---
✔ 5)
- One ray is on the
0° left side.
- The second ray points to
140° on the upper scale.
- This is an obtuse angle, opening to the right.
- ✔️ Match with
140°
---
📌 Final Matching:
| Number | Angle Diagram | Degree Match |
|--------|----------------|--------------|
| 1) | |
45° |
| 2) | |
36° |
| 3) | |
119° |
| 4) | |
70° |
| 5) | |
140° |
---
✔ Answer Key:
1) → 45°
2) → 36°
3) → 119°
4) → 70°
5) → 140°
You can now draw lines or fill in the circles to connect each diagram to its matching degree.
Let me know if you'd like this formatted as a printable answer sheet!
Parent Tip: Review the logic above to help your child master the concept of measuring and drawing angles worksheet.
