Use the unit of degrees as a standard unit to measure angles | Maths

Starter quiz

Look at the image. This shape has ______ right angle(s).
- '1' ✓
This shape has one pair of parallel sides. True or false?
- True
- False ✓
Complete the sentence. A rhombus has ______ vertices.
- '4' ✓
Look at the hands on this clock face and the arrow. The angle formed is __________.
- acute
- a right angle
- obtuse
- reflex ✓
Look at the hands on this clock face and the arrow. The angle formed is __________.
- acute
- a right angle
- obtuse ✓
- reflex
This is a trapezium. Look carefully at the vertices and the angles inside the shape. Complete the sentence. There are ______ obtuse angles in the trapezium.
- '2' ✓

Exit quiz

How many degrees are equal to one right angle? ______ °
- '90' ✓
A full turn is equal to four right angles which is ___.
- 90°
- 180°
- 300°
- 360° ✓
The angle shown is 50° which means it is an ______ angle.
- 'acute' ✓
The angle shown is 140° which means it is an ______ angle.
- 'obtuse' ✓
What is the measurement of the angle shown here? ______°
- '180' ✓
Which image shows an angle of approximately 30°?
- A
- B ✓
- C

Worksheet

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Presentation

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Lesson Details

Key learning points

Angles are measured in degrees
Degrees measure rotation

Common misconception

Pupils think that the larger the size of the arc between the two lines, the larger the angle must be.

Ensure pupils compare the same angle where the arc has been drawn on either closer to the vertex or further away from the vertex. Generalise that the position of the arc doesn't matter, though it is convention to draw it closer to the vertex.

Keywords

Angle - An angle is a measure of turn. It shows how far something has rotated.
Degree - A degree is a unit of measure for angles.
Arc - An arc is part of any curve. They can be used to show the angle between two lines.