Transformations mindmap

Enlargment

What 2 things do you always need to say to describe an enlargement? - How many times bigger you have made the shape, where the centre of enlargement is.

What does centre of enlargement mean?

- It shows where the x needs to go to show the projection lines go.

What is a scale factor? The scale factor is the distance between the the shape and the projection line. This shows you how much you need to enlarge the shape.

What happens to the angle sizes in the corner of the shape when you enlarge it? - The angles stay the same.

Rotating Shapes

 What are 3 things you need to say to describe a rotation?

1. Where is the centre of rotation

2. How much is it turned through. (1/4 or 1/2 turn or an angle)

3. Whether the rotation is anticlockwise or clockwise.

Explain what centre of rotation mean

The centre of rotation is the coordinates that show from where the shape will be turned from.

Now use these 3 things to describe the rotation on Page 1 of the myimaths lesson (i.e. describe the rotation of the triangle)

The centre of rotation of the triangle is 1,1. 

The triangle has been turned 90º and is clockwise

Rotational Symmetry

1. What rotational symmetry? Rotational symmetry is a shape that can be rotated around and still look the same.  
2. How is rotational symmetry different to line symmetry? Line symmetry is when you mirror the shape and you see the other half, but rotational symmetry is when the shape can be lifted up into it self and still look the same.
3. What do need to do check if a shape has rotational symmetry? Turn it 360º

Order	Degrees of rotation to match its shape
2	180
3	120
4	90
5	72
10	36