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An angle measures an opening

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Lines and Angles · Understand an angle as an opening · 3:26

You'll learn: Identify an angle in a physical setup

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An angle measures an opening

3:26

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An angle measures an opening

You'll learn: Identify an angle in a physical setup

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Same topic

Understand an angle as an opening

2

The vertex and arms tell us which angle
3:20
The vertex and arms tell us which angle
You'll learn: Name an angle with its vertex in the middle
An angle is an amount of turn
3:21
An angle is an amount of turn
You'll learn: Connect an opening to rotation

Next topic

Compare angles despite different arm lengths

2

Longer arms do not make a larger angle
3:32
Longer arms do not make a larger angle
You'll learn: Compare the opening rather than the drawn lengths
Compare angles by matching their positions
3:33
Compare angles by matching their positions
You'll learn: Use superimposition to compare openings

Next topic

Recognise types of angles

3

Right straight and full turns
3:29
Right straight and full turns
You'll learn: Recognise quarter, half and full turns
Acute and obtuse openings
3:29
Acute and obtuse openings
You'll learn: Compare an opening with a right angle
The larger opening can be a reflex angle
3:30
The larger opening can be a reflex angle
You'll learn: Identify the intended angle between the same arms

Next topic

Use degrees to describe a turn

3

Degrees give turns a shared unit
3:20
Degrees give turns a shared unit
You'll learn: Understand the degree convention
Use reference turns to estimate an angle
3:33
Use reference turns to estimate an angle
You'll learn: Connect reference turns to degree measures
Angles on a clock face
3:36
Angles on a clock face
You'll learn: Apply equal angular spacing to whole hour examples

Next topic

Read a protractor accurately

5

Place the protractor correctly
3:25
Place the protractor correctly
You'll learn: Align its centre and zero direction
Choose the scale that starts at zero
3:28
Choose the scale that starts at zero
You'll learn: Read the correct numbered scale
Measure a rotated diagram
3:34
Measure a rotated diagram
You'll learn: Measure independently of page orientation
Find the measure of a reflex angle
3:33
Find the measure of a reflex angle
You'll learn: Use a full turn and the smaller measured opening
Spot and repair measurement mistakes
3:31
Spot and repair measurement mistakes
You'll learn: Diagnose misalignment and wrong scale readings