Understanding angles (age 10+)
Mathematics · Geometry · procedural
Recognise angles where they meet at a point, are on a straight line, or are vertically opposite; find missing angles using these properties
What mastery looks like
- Find a missing angle at a point given the other angles (total 360°)
- Use the straight-line property (angles sum to 180°) to find an unknown angle
- Identify vertically opposite angles and use the property that they are equal to find unknowns
Check your understanding
If two straight lines cross each other, can Understanding angles (age 10+) tell you which pairs of angles are equal (vertically opposite) — and find a missing angle if you give them one of the others?
Prerequisites
Required first