Learn the 3-Step Method
1Line up.
Protractor centre exactly on the angle's point; baseline exactly along one arm.
2Start from 0°.
Follow the scale that starts at 0° on your baseline arm — protractors have two scales.
3Estimate to check.
Looks acute but you read 130°? You used the wrong scale — the answer is 50°.
Worked Example
Draw an angle of 65°.
Watch Out! Common Mistakes
Wrong scale! If it looks acute, the answer must be under 90° — it’s 65°. Estimate first.
Set-up! The protractor’s centre cross must sit exactly on the angle’s vertex, or every reading is off.
Careful! The baseline is the 0° line printed on the protractor, not its plastic bottom edge.
⬇ Cheat Sheet
- Centre on the vertex; 0° baseline along one arm.
- Read the scale that starts at 0° on that arm.
- Estimate acute/obtuse first as a check.
- To draw: line, mark the degrees, join and label.
📖 Continue Your Journey
Quick summary
- Centre on the vertex, baseline along one arm.
- Read the scale that starts at 0° on your baseline arm.
- Estimate acute-or-obtuse first — it exposes wrong-scale readings.
- To draw: base line, mark the degrees from 0°, join and label.
Frequently asked questions
Why do protractors have two scales?
So you can measure angles opening from either direction. Follow the scale that starts at 0° on the arm you lined up — and estimate first to check.
How do you draw an angle of 65°?
Draw a base line and mark a point; place the protractor's centre on the point with the baseline along the line; count up from 0° to 65° and mark; join and label.
What accuracy is expected at KS2?
Within about 2° for measuring and drawing — good line-up matters more than perfect eyesight.
Continue your child's learning journey
with the MindBlaze app.
Fun daily learning missions for children. Clear progress insights for parents — helping every child start secondary school ready to learn.
