Page 161 - MATHEMATICS COURSE FOR SECONDARY SCHOOLS BOOK 2

C
6 cm
Height of sculpture
50o
A 5 cm B
C
18 m
C
6 cm
50o
15 m B A 5 cm B
By measurement:
the length of BC on the scale drawing = 6 cm
the length of the sculpture = 3 × 6 m = 18 m
2 A scale of 1 : 5 means that 1 unit on the picture represents 5 units on the humming bird.
The actual length of the humming bird = 5 × 11.4 mm = 57 mm.
A
50o
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45o
60o
Ship B
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3
Using a scale of 1 cm to represent 1000 km, make a scale drawing to show the locations of the ships and the port and their distances from each other.
What is the distance, in kilometres, of ship A and ship B from the port?
Using a scale of 1 cm to represent 100 m, make a scale drawing to represent this sketch.
2
Two ships are 8000 km apart, as shown in the sketch.
Port
8000 km
4
How far is Batman’s signal from the light source?
Using a scale of 1 cm to represent 10 m, make a scale drawing to represent this sketch.
Ship A
Light Source
Batman’s signal
75o
500 m
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EXERCISE 7.1
Exercise 12I
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1 While camping in a forest, Una made this sketch.
150 m
35o
How high in the sky is the kite from the ground?
In an encyclopaedia there is a picture of a komodo dragon. It is drawn to a stated scale of 1 : 75. What is the actual length of the komodo dragon if its length in the picture is 3 cm?
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Using a scale of 1 cm to represent 4 m, make
a suitable scale
drawing to
5
find the height of the tree.
40o
24 m
horizontal
ground
155
385