Angle Sum Rules

MathematicsGeometryAges 9–10

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

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Learning resources

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Explore the learning path

2 before · 6 after

Before

Types of angles (age 8+)Required first Degrees and turnsRequired first

This concept

Angle Sum RulesConceptual concept

Line graphs (age 10+)Measuring angles (age 9+)Angles in triangles (age 10+)Understanding angles (age 10+)Understanding angles (age 11+)Fractions, Decimals & Percentages

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