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Acute and obtuse openings

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Lines and Angles · Recognise types of angles · 3:29

You'll learn: Compare an opening with a right angle

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Acute and obtuse openings

3:29

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Acute and obtuse openings

You'll learn: Compare an opening with a right angle

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Same topic

Recognise types of angles

2

Right straight and full turns
3:29
Right straight and full turns
You'll learn: Recognise quarter, half and full turns
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

Next topic

Draw a requested angle

3

Draw an acute or obtuse angle
3:31
Draw an acute or obtuse angle
You'll learn: Use a baseline, mark and second ray
Draw from a different baseline direction
3:31
Draw from a different baseline direction
You'll learn: Transfer the method to new orientations
Make an angle design and verify it
3:32
Make an angle design and verify it
You'll learn: Apply drawing and measurement in a small task

Next topic

Identify supercells and describe neighbours

2

Numbers can describe a position
3:20
Numbers can describe a position
You'll learn: Interpret a count of taller neighbours
A supercell beats its neighbours
3:21
A supercell beats its neighbours
You'll learn: Identify a local maximum rather than the largest number everywhere