Starter quiz
- An ______ is a measure of turn. It is often displayed as the rotation between two line segments.
- 'angle' ✓
- Which of these is an instrument used for measuring an angle?
- measuring jug
- pair of compasses
- protractor ✓
- ruler
- weighing scales
-
- Which of these units is used to measure angles?
- centimetres
- degrees ✓
- kilograms
- litres
-
- An angle that is smaller than a right angle is called an ______ angle.
- 'acute' ✓
- An angle that is greater than a right angle but smaller than a straight line is called an ______ angle.
- 'obtuse' ✓
- An angle that is greater than a straight line (i.e. greater than 180°) is called a ______ angle.
- 'reflex' ✓
Exit quiz
- In which of these images is the protractor in a correct position to measure the marked angle?
What is the size of the angle marked ?- 74° ✓
- 86°
- 106°
- 114°
-
What is the size of the angle marked ?- 74°
- 86°
- 106° ✓
- 114°
-
The size of the angle marked is ______°.- '275' ✓
Match each angle to its size.- ∠PQR⇔40° ✓
- ∠QRP⇔90° ✓
- ∠RPQ⇔50° ✓
The three letter notation for the marked angle is ∠______.- 'GMD' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- A protractor is used to draw angles.
- A protractor is used to measure the size of angles.
- A protractor measures angles in degrees.
Common misconception
Pupils read from the incorrect values on the protractor.
Encourage pupils to consider the type of angle they are measuring. If it is an acute angle, will it really measure 122°?
Keywords
Angle - An angle is a measure of turn. It is often displayed as the rotation between two line segments.
Reflex angle - An angle that is greater than a straight line (i.e. greater than 180°) is a reflex angle.
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