AC9M4M04 • Year 4 Maths
Estimating and Comparing Angles (AC9M4M04)
estimate and compare angles using angle names including acute, obtuse, straight angle, reflex and revolution, and recognise their relationship to a right angle
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Unit focus
- Compare the indicated opening or turn with a right angle. Acute is smaller than a right angle; obtuse is larger than a right angle and smaller than a straight angle.
- A straight angle is two right angles. A reflex angle is greater than a straight angle and less than a full revolution. One revolution is four right angles.
- Arm length and page orientation do not change angle size. Align a checked right-angle template at the vertex and along one arm; follow the marked arc to identify the intended angle.