# Exploring missing lines of symmetry following a reflection

## Lesson details

### Key learning points

1. In this lesson, we will investigate a variety of shapes which have already been reflected and find where the missing line of symmetry would be.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

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## Worksheet

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## Starter quiz

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### 5 Questions

Q1.
Which of the following statements is NOT correct?
The x axis can be a line of reflection
Correct answer: The x axis cannot be a line of reflection
The y axis can be a line of reflection
When shapes are reflected some of the coordinates can change
Q2.
If we are reflecting a shape onto the x axis then which of the following is correct?
Both the x and y coordinates of the reflected shapes must change
Both the x and y coordinates of the reflected shapes must stay the same
Correct answer: The x coordinate will definitely stay the same
The y coordinate will definitely stay the same
Q3.
If we are reflecting a shape onto the y axis then which of the following statements is correct?
Both the x and y coordinates of the reflected shapes must change
Both the x and y coordinates of the reflected shapes must stay the same
The x coordinate will definitely stay the same
Correct answer: The y coordinate will definitely stay the same
Q4.
A triangle with the coordinates (-5,6), (-5,7) and (-4,7) is reflected by a line of reflection along the y axis, which of the below are the correct reflected coordinates?
(-5,-5) (-7,7) (-4,-4)
(-5,-6), (-5,-7) (-4,-7)
(5,-6) (5,-7) (4,-7)
Q5.
A point with coordinates (-4,0) is reflected by a line of reflection along the x axis, what would its new reflected coordinates be?
(-4,-1)
(-4,1)
(4,0)

## Exit quiz

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### 5 Questions

Q1.
Which of the below mean the same as a line of reflection?
Straight line
Unequal line
Wiggly line
Q2.
If the distance between point A and its reflected point (A') is 12 squares then which of the statements below is true?
The distance between the mirror line and A is 12 squares
The distance between the mirror line and A is 24 squares
Correct answer: The distance between the mirror line and A' is 6 squares
The distance between the mirror line and A' is also 12 squares
Q3.
If distance between point B and a mirror line is 9 squares, then which of the following statements below is true?
Correct answer: The distance between B and B' is 18 squares
The distance between B and B' is 4.5 squares
The distance between B and B' is also 9 squares
The distance between the mirror line and B' is 4.5 squares
Q4.
The coordinates (-4,-4) and (-4,-2) are reflected, after reflection (-4,-4) becomes (3,3) and (-4,-2) becomes (1,3), which of the following statements is true?
Correct answer: The line of reflection is diagonal
The line of reflection is vertical
The x axis is the line of reflection
The y axis is the line of reflection
Q5.
A point with coordinates (1,-4) and (1,-3) are reflected to become (-3,-4) and (-3,-3) what do we know about the mirror line?
It is a diagonal line
It is a horizontal line
Correct answer: It is a vertical line
We do not have enough information