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

The rotation of an object is the turning of an object by a fixed amount and around a fixed point (called the centre of rotation), without the image being flipped or its size changing.

The centre of rotation is the fixed point about which an object is rotated.

The object is the starting figure, before a transformation has been applied.

The image is the resulting figure, after a transformation has been applied.

Checking and securing understanding of rotation

Maths

In this unit, pupils enhanced their understanding of enlargement. In this future unit, pupils investigate the effect of an enlargement on the perimeter and area of a 2-D shape and the volume of a 3-D shape. 

In the prior unit, pupils learnt about the different types of transformations. In this unit, pupils' knowledge is extended as negative scale factors are considered as are multiple transformations.

Further transformations

The fixed point about which an object is rotated is called the __________.

Shape a has been rotated 90° anti-clockwise about (-2, 2). The image is shape {{}}.

Rotation of 90° anti-clockwise about (1, 2)

Rotation of 90° anti-clockwise about (2, 1)

Describe the transformation that maps shape A onto shape B.

The transformation that maps shape A onto shape B is a rotation of {{}}° clockwise about (0, 0).

The transformation that maps shape A onto shape B is a rotation 90° clockwise about {{ }}.

A {{}} is a process that may change the size, orientation or position of a shape.

If one shape can fit exactly on top of another using {{}}, reflection or translation, then the shapes are congruent. 

Select the transformation that does not always produce an image that is congruent to the object.

Aisha: "The two triangles have the same angles so they are congruent."

Laura: "They do not have the same angles so they are not congruent."

Lucas: "They have the same angles but we need $$x$$ and $$y$$ for congruence."

Sofia: "They have the same angles but we need $$x$$ OR $$y$$ for congruence."

Some Oak pupils are discussing whether these two triangles are congruent. Who is correct?

Shapes A and B are congruent. The length of the side marked $$y$$ is {{}} cm.

Quadrilaterals A and B are similar. The length of the side marked $$y$$ is {{ }} cm.

This lesson will soon be taken down.

Checking and securing understanding of rotation

Lesson outcome