Enlargment

What 2 things do you always need to say to describe an enlargement?

The Scale factor and centre of enlargement.

What does centre of enlargement mean?

The point on the grid on which the lines connected to the outer points of the triangle meet and then expand from that point.

What is a scale factor?

The scale factor is the number of times bigger you have enlarged the shape.

Explain how to work out the scale factor on a grid, and with no grid. Use diagrams you have screenshot from the myimaths lesson.

On a grid, you can look at the number of square on at least 1 angle of the shape, then, (as an example) you double each side and if it is the same as the enlarged square then you know your scale factor would be 2.

What happens to the angle sizes in the corner of the shape when you enlarge it?

Nothing, on a triangle they always have to add up to 180°

Translation

1. Explain what a translation is.

A translation is when you move something from one place to another.

 

2. Explain how a vector works. What does it look like? What does the top number indicate? What does the bottom number indicate?

A vector works by giving the coordinates for something to move. The top number is to move 

left (Negative) or right, (Positive)   The bottom number is for Down, (Negative) or Up, (Positive)

 

3. Give a real life example of when translation is used.

When people move buildings, they need coordinates to know where to put it.

Rotating Shapes.

1. What 3 things do you need to say to describe a rotation?

1. Where the centre of rotation is.

2. How much it is turned through.

3. Whether the rotation is clockwise or anticlockwise.

1. Explain what centre of rotation means

The centre of rotation is the point of the grid that the shape turns around. 

1. 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 is at (1,1).
It has turned 90° 
It has turned clockwise.

Rotational Symmetry

In your own words explain what rotational symmetry is.

Rotational symmetry is when a shape can rotate and become itself again in more then two degrees.

A shape has an order of rotational symmetry of 2. What does this mean?

It can rotate 360° but can make the same shape in two positions.

How is rotational symmetry different from line symmetry?

Line symmetry will always be symmetric if you rotate it but rotational symmetry has a number of orders that it will be symmetric.

What do you do to check if a shape has rotational symmetry? 

Rotate it and if comes into symmetry more then once, it is rotational symmetry.

Find pictures of 3 real life objects which have rotational symmetry (not shapes, objects e.g. foods, logos)

Complete this table

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

Test score: 80%