Understanding angles (age 10+)
Recognise angles where they meet at a point, are on a straight line, or are vertically opposite; find missing angles using these properties
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Set out your lesson
“If two straight lines cross each other, can your child tell you which pairs of angles are equal (vertically opposite) — and find a missing angle if you give them one of the others?”
Full guide and materials
- Activity. Recognise angles where they meet at a point, are on a straight line, or are vertically opposite; find missing angles using these properties
What to notice. 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
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If two straight lines cross each other, can your child tell you which pairs of angles are equal (vertically opposite) — and find a missing angle if you give them one of the others?
Recognise angles where they meet at a point, are on a straight line, or are vertically opposite; find missing angles using these properties
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Check understanding
- 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
“If two straight lines cross each other, can your child tell you which pairs of angles are equal (vertically opposite) — and find a missing angle if you give them one of the others?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Geometry
- Age range
- Ages 10–11