MA26-10 Maths Coming soon

Line and rotational symmetry of 2D shapes

MA26-10

This lesson is coming soon.

Watch now instead: MA32-01 Mean, median, mode and range

In this lesson

Identify lines of symmetry and state the order of rotational symmetry of a 2D shape.

What it covers

Recognising and drawing all lines of symmetry of a 2D shape
Finding the order of rotational symmetry (how many times a shape maps onto itself in one full turn)
Linking a shape's known properties (from earlier in this chapter) directly to its symmetry — e.g. a rectangle has 2 lines and order 2, an equilateral triangle has 3 lines and order 3, a kite has 1 line and order 1
Extra time on rotational symmetry specifically, since the evidence shows this is the weaker skill

Key words

lines of symmetry order of rotational symmetry draw all lines of symmetry rotational symmetry

For: Cambridge IGCSE 0580, Edexcel IGCSE 4MA1, OCR GCSE J560

On the specification

Board	Spec	Statement
Cambridge IGCSE 0580	C4.5	Recognise line symmetry and order of rotational symmetry in two dimensions.
Cambridge IGCSE 0580	E4.5	Recognise line symmetry and order of rotational symmetry in two dimensions.
Edexcel IGCSE 4MA1	F4.3A	Identify any lines of symmetry and the order of rotational symmetry of a given two-dimensional figure
OCR GCSE J560	8.04c	Identify reflection and rotation symmetries of triangles, quadrilaterals and other polygons.

For teachers

This GCSE Maths lesson teaches line and rotational symmetry of 2D shapes. By the end, students should be able to identify lines of symmetry and state the order of rotational symmetry of a 2D shape. It works through two worked examples and the mistakes examiners report.