Estimating Angles
Estimate and compare acute, obtuse, and reflex angles in degrees; classify angles by type and order them by size
Teaching approaches
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1 approach
If you show your child three different angles drawn on paper, can they estimate which is biggest, label each as acute, obtuse, or reflex — and then check with a protractor?
Estimate and compare acute, obtuse, and reflex angles in degrees; classify angles by type and order them by size
Learning resources
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This concept
Check understanding
- Estimate an angle as approximately 130° and classify it as obtuse
- Identify a reflex angle in a diagram and estimate it as about 270°
- Order four angles from smallest to largest by estimation before measuring
“If you show your child three different angles drawn on paper, can they estimate which is biggest, label each as acute, obtuse, or reflex — and then check with a protractor?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Geometry
- Age range
- Ages 9–10