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CHAPTER Scale Drawings 6. (a) length of drawing = 200 000 8. (a) length of drawing 1 1
Mathematics Form 3 Chapter 4 Scale Drawings
1
4
Scale = 1 :
actual length
2
1
length of drawing
Lukisan Berskala
=
200 000
2
12 000 000 = 60 cm length of object = 1
8 = 1
length of object 1
(b) Length of square field = 900 2
1. (i) 1 (b) Scale = length of drawing = 30 m
(ii) drawing / lukisan actual length Length of object = 8 × 1
(iii) 10 = 40 length of drawing = 1 = 4 cm 2
(iv) actual object / objek sebenar 4 actual length 300
(v) cm 10 length of drawing 1
= =
1 3 000 300 1.5 cm
1 3 000
= Length of drawing =
2. Diagrams Scale drawings Scale 1 300 1.0 cm 1.0 cm
Rajah Lukisan berskala Skala 10 = 10 cm 0.5 cm
1 1.0 cm
I Yes 1 : 2 = 1 : 10 3 cm
(c) Diameter of coin = 5 cm 1.5 cm
II No –
height of drawing length of drawing 1
(c) Scale = =
III No – actual height actual length 1 4 cm
4 2
IV No – = 1.4 × 100 length of drawing 1
1 5 = 1 9. (a) Length of square A = 49
1 =
V Yes 1 : 35 2 = 7 cm
2
= 1 : 35 Diameter on the drawing = 5 × 2 Length of square B = 196
= 10 cm = 14 cm
3. (a) 10 cm : 1 km 3 1 length of drawing 14
= 10 cm : 1 × 100 000 cm 5. (a) actual length = 10 000 length of drawing 1 actual length = 7
= 1: 10 000 7. (a) = 1
actual length = 3 × 10 000 actual length 100 =
= 30 000 cm base of drawing = 12 × 100 × 1 7
(b) 2 cm : 1m = 0.3 km 100 14
= 2 cm : 1 × 100 cm = 12 cm 1
= 1: 50 5 1 height of drawing = 6 × 100 × 1 = 1
(b) = 100 2
actual length 2 000 = 6 cm
(c) 5 cm : 2 km actual length = 5 × 2 000 1
= 5 cm : 2 × 100 000 = 10 000 cm Therefore, the scale used is 1 : 2
= 1 : 40 000
= 100 m

height of drawing 9 1 (b)
4. (a) Scale = (c) = 4 1
actual height actual length 1 =
2 actual distance 3 000 000
= 2 actual distance = 4 × 3 000 000 cm
600 1
1 actual length = 9 × 2 = 12 000 000 ÷ 100 000 km
= = 120 km
300 = 4.5 cm
= 1 : 300

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BOOKLET ANS MATH F3.indd 9 03/01/2020 10:20 AM