New
New
Year 7

# Reflecting objects

I can reflect objects using a range of lines of reflection

New
New
Year 7

# Reflecting objects

I can reflect objects using a range of lines of reflection

## Lesson details

### Key learning points

1. The line of reflection may go through part of the object.
2. The line of reflection may not touch the object.
3. Tracing paper can be a useful tool for performing reflections.

### Common misconception

Diagonal reflections that incorrectly look like rotations or translations of the object.

False reflections that look like this are due to students not counting diagonals of grid squares, perpendicular to the mirror line.

### Keywords

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

The first learning cycle's "I do, you do", perform each handful of steps (split up by slide) completely before asking the students to copy the steps for their example. Student example is simply to allow students to copy the diagram down if suitable.
Teacher tip

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
The is equidistant from corresponding points on the object and its reflected image.
Correct Answer: line of reflection, reflection line, mirror line
Q2.
Which of these coordinates is suitable for defining the location of the line of reflection for this reflection?
(6, 0)
Correct answer: (2, 6)
Correct answer: (7, 6)
(12, 8)
(12, 4)
Q3.
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)"
vertical
diagonal
Q4.
Which of these coordinates lies on the line of reflection for this example?
Correct answer: (10, 4)
(6, 2)
(14, 2)
Correct answer: (10, 2)
(7, 7)
Q5.
Which of these statements are valid for describing this reflection?
a horizontal reflection
Correct answer: a vertical reflection
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)
Correct answer: with a line of reflection through the points (3, 7) and (6, 7)
Q6.
Which of these coordinates is suitable for defining the location of the line of reflection for this reflection?
(6, 2)
Correct answer: (9, 5)
(12, 8)
Correct answer: (7, 7)
Correct answer: (6, 8)

## Exit quiz

### 6 Questions

Q1.
Which of these properties change when an object is reflected?
lengths of sides
size of angles
Q2.
Which of these things must you draw onto the tracing paper when reflecting using tracing paper?
Correct answer: the object
the \$\$x\$\$-axis or \$\$y\$\$-axis
Correct answer: the line of reflection
an extra × marked on the object
Correct answer: an extra × marked on the line of reflection
Q3.
Write down the coordinates for the reflection of vertex A in the line of reflection drawn.
Correct Answer: (16, 7), (16,7), 16,7
Q4.
Write down the coordinates for the reflection of vertex B in the line of reflection drawn.
Correct Answer: (12, 9), (12,9)
Q5.
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.
Correct Answer: (18, 6), (18,6), 18,6
Q6.
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.
Correct Answer: (7, 6), (7,6), 7,6