Types of angles
Identify acute and obtuse angles; compare and order angles up to two right angles by size
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Teaching Table
Set out your lesson
“If your child looks at the hands on a clock showing different times, can they tell you which angle between the hands is acute (sharper than a right angle) and which is obtuse (wider)?”
Full guide and materials
- Activity. Identify acute and obtuse angles; compare and order angles up to two right angles by size
What to notice. Classify given angles as acute, right, or obtuse • Order four angles from smallest to largest by visual comparison • Identify all acute and obtuse angles in a given triangle or quadrilateral
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If your child looks at the hands on a clock showing different times, can they tell you which angle between the hands is acute (sharper than a right angle) and which is obtuse (wider)?
Identify acute and obtuse angles; compare and order angles up to two right angles by size
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Check understanding
- Classify given angles as acute, right, or obtuse
- Order four angles from smallest to largest by visual comparison
- Identify all acute and obtuse angles in a given triangle or quadrilateral
“If your child looks at the hands on a clock showing different times, can they tell you which angle between the hands is acute (sharper than a right angle) and which is obtuse (wider)?”
Curriculum record
- Type
- Conceptual
- Subject
- Mathematics
- Domain
- Geometry
- Age range
- Ages 8–9