A reflection of a shape is the mirror image of the shape.  An object is reflected when it is flipped over a fixed line.

The sense of an object is the direction of the orientation of the object.

Introduction to reflections

Maths

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

Transformations

The sense of a word stays the same after translation because I can still read it

The sense of a word changes after rotation because it is harder to read

The sense of a word changes if its letters look they've been written backwards

The sense of a word stays the same after reflection because I can figure it out

Which of these sentences uses the word "sense" correctly?

In which of these images has the sense changed compared to the object?

Which of these transformations change sense?

Complete this sentence: "When an object is reflected, the lengths of its sides are invariant. This means the lengths of the sides remain _______ ."

Which of these diagrams shows a reflection?

Which of these images is a reflection of its object? 

When a vertex is labelled M$$^{\prime}$$, it means the __________ of M.

Which point on the image is corresponding to vertex A on the object?

A transformation is a process that may change the size, orientation, or __________ of a shape.

In which of these images is the orientation invariant when compared to its object?

In which of these images has the direction of the orientation reversed when compared to its object - where the direction of ABCD on the object is clockwise?

Which property may not be invariant when an object is rotated?

This lesson will soon be taken down.

Introduction to reflections

Lesson outcome