Scaled Drawings

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Scaled Drawings Compass Points
Working with scales
Scale Drawings
Practical Scale Drawings
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Bearings
2
Starter Questions
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1cm
1cm
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Scaled Drawings Compass Points
Learning Intention
Success Criteria

1. To be able to understand the term scaled drawings.

1. To understand the term scaled drawing and
how they are used in real life.
2. Interpret scaled drawing into real-life
measurements.
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4
Scaled Drawings Compass Points
Definition
A scale of 1 cm 2m
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This simply means for every 1cm measured on
a drawing this represents 2m in real-life.
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Scaled Drawings Compass Points
4x25 100cm
4cm
2cm
2x25 50cm
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The scale of this drawing is 1cm 25cm
What is the actual length and breadth of the TV ?
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Scaled Drawings Compass Points
12x50 600cm 6m
12cm
Living room
8cm
8x50 400cm 4m
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The scale of this drawing living room is 1cm
50cm
What is the actual length and breadth of the room
?
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Scaled Drawings Compass Points
Now try Exercise 2 Ch5 (page 52)
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8
Starter Questions
14cm
7cm
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10cm
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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.
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10
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
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2cm
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Scaled Drawings Compass Points
Another way
6cm
4cm
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Key Points

1. Work out suitable scale
2. Work out length and breadth

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Scaled Drawings Compass Points
Now try Exercise 3 Ch5 (page 55)
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Starter Questions
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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.
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15
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.
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Make a scaled drawing and work Out the real
height of the pole.
Use a scale of 1cm 2m
6m
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Scaled Drawings Compass Points
Solution
Using a scale of 1cm 2m
T
Step 1 Draw line XY3cm
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.
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4.3cm
Step 5 Measure length YT.
Step 6 Multiply length YT. by scale
factor.
4.3 x 2 8.6m
X
Y
Flag pole is 8.6m high
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Scaled Drawings Compass Points
Now try Exercise 4 Ch5 (page 58)
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Starter Questions
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Scaled Drawings Compass Points
Learning Intention
Success Criteria
1. Understand compass points.
1. To understand the compass points.
2. Work out simple directions.
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Compass Points
21
Estimate the bearing of each aircraft from the
centre of the radar screen.
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Scaled Drawings Compass Points
Now try Exercise 5 Ch5 (page 61)
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