1. Scaled Drawings & Compass Points
Working with scales
Scale Drawings
Practical Scale Drawings
Bearings
4-May-19
Created by Mr. Lafferty Maths Dept.

2. Created by Mr. Lafferty Maths Dept.
Starter Questions
2cm
1cm
1cm
4-May-19
Created by Mr. Lafferty Maths Dept.

3. Scaled Drawings & Compass Points
Learning Intention
Success Criteria
1. To understand the term scaled drawing and how they are used in real life.
To be able to understand the term scaled drawings.
2. Interpret scaled drawing into real-life measurements.
4-May-19
Created by Mr. Lafferty Maths Dept.

4. Scaled Drawings & Compass Points
Definition
A scale of
1 cm = 2m
This simply means for every 1cm measured on a
drawing this represents 2m in real-life.
4-May-19
Created by Mr. Lafferty Maths Dept.

5. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
4x25= 100cm
4cm
2cm
2x25 = 50cm
The scale of this drawing is 1cm = 25cm
What is the actual length and breadth of the TV ?
4-May-19
Created by Mr. Lafferty Maths Dept.

6. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
12x50 = 600cm = 6m
12cm
Living room
8cm
8x50 = 400cm =4m
The scale of this drawing living room is 1cm = 50cm
What is the actual length and breadth of the room ?
4-May-19
Created by Mr. Lafferty Maths Dept.

7. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
Now try Exercise 2
Ch5 (page 52)
4-May-19
Created by Mr. Lafferty Maths Dept.

8. Created by Mr. Lafferty Maths Dept.
Starter Questions
14cm
7cm
10cm
4-May-19
Created by Mr. Lafferty Maths Dept.

9. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
Learning Intention
Success Criteria
1. Interpret information in a problem and create a suitable scaled drawing.
1. To draw a scale drawing given suitable information.
4-May-19
Created by Mr. Lafferty Maths Dept.

10. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
Problem
A garden is rectangular shape and has length
12m and breadth 8m. Draw a scale drawing
using a suitable scale.
3cm
1cm = 4m
Scale
Garden
2cm
3cm = 12m
Length
2cm = 8m
Breadth
4-May-19
Created by Mr. Lafferty Maths Dept.

11. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
Another way
6cm
1cm = 2m
Scale
6cm = 12m
Length
4cm
4cm = 8m
Breadth
Key Points
Work out suitable scale
Work out length and breadth
4-May-19
Created by Mr. Lafferty Maths Dept.

12. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
Now try Exercise 3
Ch5 (page 55)
4-May-19
Created by Mr. Lafferty Maths Dept.

13. Created by Mr. Lafferty Maths Dept.
Starter Questions
4-May-19
Created by Mr. Lafferty Maths Dept.

14. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
Learning Intention
Success Criteria
1. Interpret information in a problem to create a suitable scaled drawing.
1. To solve real-life problems using scaled draws.
2. Use a scale drawing to solve a given problem.
4-May-19
Created by Mr. Lafferty Maths Dept.

15. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
Problem
The sketch shows a flag-pole YT supported by
a wire. The distance from X to Y is 6m and
angle TXY = 55o.
55o X T Y
Make a scaled drawing and work
Out the real height of the pole.
Use a scale of 1cm = 2m 6m
4-May-19
Created by Mr. Lafferty Maths Dept.

16. Scaled Drawings & Compass PointsX T Y 6m
Scaled Drawings & Compass Points
Solution
Using a scale of 1cm = 2m T
Step 1: Draw line XY=3cm
Step 2: Draw a line straight up from Y.
Step 3: Measure angle 55o from X.
Step 4: Draw line from X to vertical line
and mark T at crossover point.
Step 5: Measure length YT.
4.3cm
Step 6: Multiply length YT.
by scale factor.
4.3 x 2 = 8.6m X Y
Flag pole is 8.6m high
4-May-19
Created by Mr. Lafferty Maths Dept.

17. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
Now try Exercise 4
Ch5 (page 58)
4-May-19
Created by Mr. Lafferty Maths Dept.

18. Created by Mr. Lafferty Maths Dept.
Starter Questions
4-May-19
Created by Mr. Lafferty Maths Dept.

19. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
Learning Intention
Success Criteria
1. Understand compass points.
1. To understand the compass points.
2. Work out simple directions.
4-May-19
Created by Mr. Lafferty Maths Dept.

20. Created by Mr. Lafferty Maths Dept.
Compass Points N S E W
090o
360/000o
270o
180o NW
315o NE
045o SW
225o SE
135o
4-May-19
Created by Mr. Lafferty Maths Dept.

21. 360/000o
090o
180o
270o W E N S
Air Traffic Controller
Control Tower
030o
330o
Estimate the bearing of each aircraft from the centre of the radar screen.
315o
045o
290o
075o
250o
225o
200o
135o
110o
170o
4-May-19
Created by Mr. Lafferty Maths Dept.

22. Created by Mr. Lafferty Maths Dept.
Scaled Drawings & Compass Points
Now try Exercise 5
Ch5 (page 61)
4-May-19
Created by Mr. Lafferty Maths Dept.