Learning Map Where we’re up to

AC9M4M04

Parents start here

Your child is learning to guess an angle's size and name it — acute, obtuse or reflex — then check with a protractor.

  • Estimate an angle as approximately 130° and classify it as obtuse
  • Identify a reflex angle in a diagram and estimate it as about 270°
Estimating Angles →

One skill from the map, ages 9–10 — its page has the rest of the checklist and what comes next. Candidate alignment, machine-suggested and unreviewed (v0.1).

“estimate and compare angles using angle names including acute, obtuse, straight angle, reflex and revolution, and recognise their relationship to a right angle”
MathematicsYear 4Measurement strand

Official source: Australian Curriculum v9 — Mathematics ↗ · Content © ACARA, CC BY 4.0 · unofficial reference — verify at the official site

Other skills on the Learning Map matched to this code — candidate alignments, machine-suggested and unreviewed (v0.1).

high confidence3 skills

Measuring angles (age 9+)Geometryages 9–10 Types of anglesGeometryages 8–9 Measuring anglesGeometryages 9–10
8 other candidate matches — 5 medium, 3 low

medium confidence

Lines, Rays & AnglesGeometryages 9–10 Understanding angles (age 10+)Geometryages 10–11 What Is an Angle?Geometryages 9–10 Understanding anglesGeometryages 7–8 Types of angles (age 8+)Geometryages 8–12

low confidence

Right Angles & TurnsGeometryages 7–8 Angle Sum RulesGeometryages 9–10 Angles in triangles (age 10+)Geometryages 10–11

Alignments generated 9 July 2026, unreviewed.

Nearby in the Measurement strand:
AC9M4M01AC9M4M02AC9M4M03

Teaching this? Learning Map for teachers has the sequencing view and copy-paste words to send home.

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