Measuring angles (age 9+)
Your child can find a missing angle by adding or taking away. If two angles on a line are 65° and one is unknown, the other is 115°.
In curriculum terms
Recognise angle measure as additive; find unknown angles by adding or subtracting on a diagram using equations with a symbol for the unknown
Ages are typical, not deadlines — follow your child’s pace. How to help at home →
How to tell they’ve got it
Tick these off as you see them — no test required.
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Try this together
If two angles sit next to each other on a straight line and one is 65°, can your child work out the other angle — knowing that angles on a straight line always add up to 180°?
Where this sits on the map
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Curriculum alignment
Where this fits in the official school curriculum — our best automated guess, not yet checked by a person.
Show candidate curriculum codes · 3 ACARA · 2 NSW · 3 VIC
Australian Curriculum v9 candidate
identify the relationships between angles on a straight line, angles at a point and vertically opposite angles; use these to determine unknown angles, communicating reasoning
estimate, construct and measure angles in degrees, using appropriate tools including a protractor, and relate these measures to angle names
estimate and compare angles using angle names including acute, obtuse, straight angle, reflex and revolution, and recognise their relationship to a right angle
NSW syllabus codes & stages only
Victorian Curriculum 2.0 codes & levels only
These are candidate alignments generated by semantic matching — machine-suggested and unreviewed (v0.1), not official or verified mappings. For official curriculum content see australiancurriculum.edu.au, curriculum.nsw.edu.au and f10.vcaa.vic.edu.au. Don’t rely on them for registration or compliance purposes.