Stage 2 - space and geometry – angles

In Stage 2, students need informal experiences of creating, identifying and describing a range of angles. This will lead to an appreciation of the need for a formal unit to measure angles.

Strategy

Students can:

  • construct angles
  • compare angles and classify them as equal to, greater than or less than a right angle

Activities to support the strategy

Activity 1 – making angles

Students join geostrips, Meccano or cardboard strips. The term angle can be introduced and related to the amount of turning of one of the two strips. A small amount of turning is a small angle and a large amount of turning is a larger angle.

Students join two geostrips and arrange them so that one covers the other. The top strip is then rotated to make an angle. Students then find ‘corners’ around the room that the angle will fit around or into. Discuss which types of angles are common and which are not.

Students construct an angle wheel by cutting two identical circles of different coloured paper. Slits are cut to the centres of each circle.

The circles are then overlapped, with slits together. The lower right part of the circle is slipped under the upper right part of the bottom circle to make the wheel.

Students use the wheel to make different angles.

Activity 2 – angle display

Students make different angles using angle wheels above and display these with headings naming the type of angle shown.

  • equal to
  • greater than
  • less than

Studyladder – Comparing an angle to a right angle

Activity 3

Students use a clock face to create angles equal to, greater than and less than a right angle, by turning the hour hand. They then draw and classify the angles.

Clock set to 3pm is equal to a right angle
Image: Equal to a right angle
Clock set to 4pm is greater than a right angle
Image: Greater than a right angle
Clock set at 2pm is less than a right angle
Image: Less than a right angle

References

Australian curriculum

CMMG064 - Identify angles as measures of turn and compare angle sizes in everyday situations.

NSW Syllabus

MA2-16MG - Identifies, describes, compares and classifies angles.

Student resources

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