New

New

Year 6

# Identify and describe the relationship between irregular polygons using scale factors

You can identify and describe the relationship between two irregular polygons using scale factors

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New

New

Year 6

# Identify and describe the relationship between irregular polygons using scale factors

You can identify and describe the relationship between two irregular polygons using scale factors

Share activities with pupils

Share function coming soon...

## Slide deck

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## Lesson details

### Key learning points

- Two similar shapes can be described as being 'x' times greater or smaller than each other.
- If one similar shape is smaller than another, the scale factor is a fraction.
- Shapes related by a scale factor are similar.

### Common misconception

Not comparing the same or corresponding sides of related shapes.

Label the sides of shapes clearly and refer to them with consistent language of height and width.

### Keywords

Irregular polygon - An irregular polygon is a polygon where the sides and angles are not all equal

Make sure that pupils have the opportunity to explain what is happening as the shapes are scaled and that all dimensions are being multiplied by the same scale factor.

Teacher tip

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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## Worksheet

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## Starter quiz

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### 6 Questions

Q1.

There is lots of information given about this shape. Which bits of information tell you about its dimensions?

Area is 36 squared cm

Opposite sides are parallel

Angles are right angles

Q2.

Which of these pairs of shapes are similar?

B

A and B

Neither A or B

Q3.

What is the scale factor between hexagons A and B?

2

3

4

8

Q4.

What number is one and a half times the size of 6?

3

6

12

Q5.

Which of these shapes is similar to triangle A with a scale factor of 4?

Q6.

Which of these shapes is similar to square A with a scale factor of one half?

## Exit quiz

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### 6 Questions

Q1.

Which of these shapes are regular polygons?

rectangle

trapezium

right angled triange

Q2.

Which of these shapes are irregular polygons

equilateral triangles

square

Q3.

Is a hexagon a regular shape?

Yes

No

Q4.

A and B are similar rectangles. What is the missing dimension in rectangle B?

15 cm

40 cm

20 cm

Q5.

This ratio table gives the dimensions of two rectangles. What is the scale factor between the rectangles?

2

3

4

5

Q6.

What is the relationship between the height and width of both rectangles?