Checking and securing understanding of reflection
I can describe a reflection and perform a given reflection on an object.
- Year 10
Checking and securing understanding of reflection
I can describe a reflection and perform a given reflection on an object.
Lesson details
Key learning points
- The line of reflection can be vertical/horizontal/diagonal.
- The line of reflection may go through part of the object.
- The line of reflection may not touch the object.
- To reflect, you need a line to reflect in.
Keywords
Transformation - A transformation is a process that may change the size, orientation or position of a shape.
Reflection - A reflection of a shape is the mirror image of the shape. An object is reflected when it is flipped over a fixed line (line of reflection), without the image being turned or its size changing.
Line of reflection - The line of reflection is the fixed line about which an object is reflected. The object and image are equidistant from the line of reflection.
Object - The object is the starting figure, before a transformation has been applied.
Image - The image is the resulting figure, after a transformation has been applied.
Common misconception
Pupils may find reflecting across a diagonal line more challenging than vertically or horizontally.
Pupils may find it easier with tracing paper, or rotating their book/paper so the line of reflection is vertical.
Equipment
Tracing paper
Licence
Lesson video
Loading...
Prior knowledge starter quiz
6 Questions
Q1.A translation is a in which every point of a shape moves the same distance in the same direction.
Q2.Match each description to the correct vector.
4 left and 5 down - $$\begin{pmatrix} -4 \\ -5 \\ \end{pmatrix}$$
4 right and 5 up - $$\begin{pmatrix} 4 \\ 5 \\ \end{pmatrix}$$
5 left and 4 up - $$\begin{pmatrix} -5 \\ 4 \\ \end{pmatrix}$$
5 right and 4 down - $$\begin{pmatrix} 5 \\ -4 \\ \end{pmatrix}$$
4 left and 5 up - $$\begin{pmatrix} -4 \\ 5 \\ \end{pmatrix}$$
5 right and 4 up - $$\begin{pmatrix} 5 \\ 4 \\ \end{pmatrix}$$
Q3.The point P(4, 3) is translated by the vector $$\begin{pmatrix} -2 \\ 1 \\ \end{pmatrix}$$ to P'. What are the coordinates of P'?
Q4.Shape P is translated onto shape Q by the vector $$\begin{pmatrix} -3 \\ 2\\ \end{pmatrix}$$. What transformation will map shape Q onto shape P?
Q5.Select the correct statements.
Q6.Match each line to its equation.
Line A - $$x$$ = -3
Line B - $$y$$ = 2
Line C - $$y$$ = $$x$$
Line D - $$x$$ = 2
Line E - $$y$$ = -3
Assessment exit quiz
6 Questions
Q1.A reflection of a shape is the image of the shape.
Q2.Which of these diagrams show a reflection?
Q3.The line of reflection is Line .
Q4.Shape A is reflected onto shape B. What is the equation of the line of reflection?
Q5.Describe this transformation fully.
Q6.The point $$P$$ has coordinates $$(3, -2)$$. $$P$$ is reflected in different lines of reflection. Match the coordinates of the image of $$P$$ to the equation of the line of reflection.
$$P'(3, 2)$$ - $$y = 0$$
$$P'(-3, -2)$$ - $$x= 0$$
$$P'(-2, 3)$$ - $$y=x$$
$$P'(2, -3)$$ - $$y=-x$$
