1. Drawing
This lesson is about drawing to scale and why it is useful. Students need to be aware of the units of metres and centimetres and how to convert between them in order to complete the lesson. They must also understand how to multiply and divide, as well as having access to a calculator, pencil and compass.

2. 1 cm on drawing = 10cm in real life
Labels
Key
Scale
= iron sheet
= wire mesh
2.4 m
1.2 m
1 m
1.5 m
Drawings need dimensions and materials lists.
Scales are better than labels, as it takes less work when you have a complex drawing. Also, if you need to know a dimension which is not labelled, it can simply be measured from the drawing using a ruler.
2 m
1.5 m
1:10
SCALE
1 cm on drawing = 10cm in real life

3. 10cm in real life = 1 cm on drawing
How Scale works?
150
10cm in real life = 1 cm on drawing
1.5 metres
= _____ centimetres (in real life) 15
___ centimetres (on drawing)
Self explanatory slide showing how scale works.
1:10 20
___ centimetres (on drawing)
2 metres
200
= _____ centimetres (in real life)

4. Scale 1:100 1:100 ? 5m 5cm 5cm 5m 1:10 1:2 70cm 7m 2cm 4cm ? 1:2 1:20
Find out the real life length of the blue lines ?
1:100
1:100 ?
5cm 5m
5cm 5m
1:10
1:2
70cm 7m
2cm
4cm ?
1:2
1:20 ?
50cm 1m
4cm
0.8m
1:50
1:50 ?
20cm
10m
4cm 2m

5. Scale
side
SCALE
roof

6. Your Turn! Now complete side and top views of your design! SCALE
Ask the students to draw side and top projections of their designs.
SCALE

7. Drawing Triangles

8. Drawing Triangles 1:10 1.2 metre 1.2 metre 2 metres 12 centimetres

9. Drawing Triangles SCALE SCALE SCALE
Use the same SCALE as you did before

10. Your Turn!
Now complete the end view of your design!
SCALE