Angle Sum Rules
Know that angles at a point sum to 360° (one whole turn), angles on a straight line sum to 180°, and vertically opposite angles are equal; use these facts to find missing angles
Teaching approaches
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1 approach
If three angles meet at a point and two of them are 120° and 95°, can your child work out the third angle — knowing all the angles at a point add up to 360°?
Know that angles at a point sum to 360° (one whole turn), angles on a straight line sum to 180°, and vertically opposite angles are equal; use these facts to find missing angles
Learning resources
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2 before · 6 after
This concept
Check understanding
- State that two angles on a straight line add to 180°
- Explain that four right angles at a point make 360°
- Identify 270° as three right angles
“If three angles meet at a point and two of them are 120° and 95°, can your child work out the third angle — knowing all the angles at a point add up to 360°?”
Curriculum record
- Type
- Conceptual
- Subject
- Mathematics
- Domain
- Geometry
- Age range
- Ages 9–10