Topics · Shapes & Measurement
Angles
An angle is a turn. Compare turns, then measure and draw them with a protractor.
Ramps, roofs, clock hands — angles are turns you can measure.
More ways into this idea
- Play with itAngle LabSwing two angles as far as they go — the third answers
- Make it a gameTriangle ForgeForge triangles to order — or prove the order impossible
- Test yourselfA fresh mixed set, whenever you likeExplanations after every question. Nothing is recorded.
Common sticking points
- A common sticking point is thinking longer arms make a bigger angle. The angle is the TURN, not the arm length.
- Another is reading the wrong protractor scale — 60° instead of 120°. Estimate first (is it more or less than a right angle?), then let the estimate pick the scale.
Try this together
Open a door a little, then a lot — that's an angle growing. Now open scissors to make the 'same angle' as a corner of a page (90°). Long scissors, short scissors: does blade length change the turn?
1–5 minutes, no materials to buy, nothing to hand in.
Ontario curriculum details
- E2.3Compare angles and their sizes
- E2.4Measure and draw angles with a protractor
Plain-language summaries. See the full curriculum for every expectation and the official source.