The line of reflection is the line about which an object is reflected. The object and image are equidistant from the line of reflection.

Reflecting objects

Maths

Checking understanding of basic transformations

Introduction to translation

Describing a translation

Translating objects

Introduction to rotations

Describing a rotation's direction and size

Understanding the centre of rotation

Rotating objects

Introduction to reflections

Describing a reflection

Introduction to enlargements

Describing an enlargement

Enlarging objects

Transformed objects

Investigating transformations with Desmos

Investigating transformations with GeoGebra

Problem solving with transformations

In this unit, pupils explore the effects of different transformations and whether the transformed shape is congruent or similar to the original shape. This is built on in the future unit where pupils formalise the criteria for determining congruence in triangles and study rotational symmetry

In this unit, pupils translated and reflected simple shapes on the full coordinate grid. In this unit, these processes are formalised and rotation and enlargement are introduced

This unit introduces pupils to shape tranformations: enlargements, rotations, reflections and translations both by hand and with technology.

Transformations

Which of these properties change when an object is reflected?

an extra × marked on the line of reflection

Which of these things must you draw onto the tracing paper when reflecting using tracing paper? 

Write down the coordinates for the reflection of vertex A in the line of reflection drawn.

Write down the coordinates for the reflection of vertex B in the line of reflection drawn.

This object is reflected in a line passing through the coordinates (10, 0) and (10, 5). Write down the coordinates for the reflection of vertex C in the line of reflection.

This object is reflected in a line passing through the coordinates (0, 8) and (5, 3). Write down the coordinates for the reflection of vertex D in the line of reflection.

The {{}} is equidistant from corresponding points on the object and its reflected image.

Which of these coordinates is suitable for defining the location of the line of reflection for this reflection?

Complete this sentence for the following description of a reflection: "A __________ reflection with line of reflection passing through the coordinates (9, 0) and (9, 30)"

Which of these coordinates lies on the line of reflection for this example?

with a line of reflection through the points (3, 3) and (3, 11)

with a line of reflection through the points (4, 1) and (4, 13)

with a line of reflection through the points (3, 7) and (6, 7)

Which of these statements are valid for describing this reflection?

Reflecting objects

Lesson outcome