One right angle
One right angle matches one quarter turn.
quarter turn
A right angle is the key turn to remember.
Year 3
Identify right angles and recognise that two make a half-turn, three make three quarters of a turn and four make a complete turn
Identify a right angle and connect right angles to quarter, half, three-quarter and full turns.
Lesson overview
Geometry - properties of shape
A right angle is the same size as a quarter turn. Two right angles make a half turn, three right angles make three quarters of a turn, and four right angles make a complete turn.
Build larger turns
Two right angles make a half turn and four make a full turn.
half turn
complete turn
Count right angles in the turn.
Three quarter turn
Three right angles make three quarters of a turn.
three quarter turn
This is more than a half turn but not a full turn.
Worked example
How many right angles make a complete turn?
- A complete turn is all the way round.
- One right angle is one quarter turn.
- Four quarters make one whole.
- So four right angles make a complete turn.
Try it
Link the name of the turn to the number of right angles it contains.
Question 1
How many right angles make a half turn?
count the right angles
Question 2
A quarter turn is the same as how many right angles?
one right angle
Question 3
How many right angles make three quarters of a turn?
three right angles
Question 4
How many right angles make a complete turn?
all the way round
Question 5
Which statement is correct?
Common mistakes
Watch for these when working through the lesson.
- Thinking a half turn is one right angle.
- Mixing up three quarters of a turn with a quarter turn.
- Forgetting that a complete turn is all the way round.
Related topics
These ideas fit closely with this lesson.
- Recognise angles as a property of shape or a description of a turn.
- Identify whether angles are greater than or less than a right angle.