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4. (a) False 39, 41, 42, 43, 45, 47, 48, Self Practice 13.2b
(b) True 52, 56 1. 1.5 + 2.0 = 2.5
2
2
2
(c) True (b) 12 minutes Thus, the wall is vertical.
5. (a) Number of (c) Much of the time taken to 2. 160°
Laptops Sold fix the leaking pipes ranges
from 30 minutes to 39 Mastery 13.2
6 5 minutes. 2 2 2
Number of laptops 4 3 2 8. (a) Diagram (a) 1. (a) Yes; 9 + 40 = 41 2
2

2
(b) No; 27 + 35 ≠ 45
2
2
2
The scale used on the
0 1 (b) Diagram (b). Not ethical. (c) Yes; 2.5 + 6 = 6.5
2
2
(d) Yes; 13 + 84 = 85
2
January February March April May June vertical axis of this line 2. 12 + 16 = 20
graph is larger.
2
2
2
Month \ The triangle is a right-angled
Chapter 13 The Pythagoras’ triangle. Therefore, the triangular
(b) Theorem piece of wood can be fixed
Number of
Laptops Sold perfectly onto the L-shaped
Self Practice 13.1a structure.
6 5 1. (a) AC 3. 15 + 20 = 25
Number of laptops 4 3 2 (b) b All angles at the vertices of the
2
2
2
PR is the hypotenuse of
(c)
quadrilateral are right angles,
0 1 ∆PQR. thus the quadrilateral is a
ST is the hypotenuse of
January February March April May June ∆SPT. rectangle.
Month Self Practice 13.1b Let’s Practise
2
2
1. (a) AC = AB + BC 1. (a) 10 cm
2
The bar chart is more 2 2 2 (b) 24 cm
suitable in representing this (b) LN = LM + MN  2
2
2
2
2
data because the number (c) r = p + q 2. 2 + 150 = 150.01 m
2
2
2
of laptops sold can be read (d) z = x + y 3. (a) 15 cm
from the height of the bars. Self Practice 13.1c (b) Right-angled triangle;
2
2
6. (a) Year 2010, RM13 million 1. (a) 10 8 + 15 = 17 2
2
(b) Year 2012, RM2 million (b) 24 4. 104 cm
18 + 6 = 18.97 m
2
(c) Loss of RM8 million (c) 16.64 5.  2
(d) (i) (d) 0.66 6. 8 + 15 = 17
2
2
2
Prof its of Cekap Company 2. (a) 14 cm SR = 17 cm
(b) 8 cm 2
14 (c) 25.63 cm 7. 36 cm
12 8 Self Practice 13.1d 8. 0.4  2
10
Prof it (million RM) –2 6 4 2 0 1. 54 cm 13.1 10. Using the concept of
2
9. 20 – 15 – 12 = 11 m
Pythagorean triples, (3, 4, 5)
2. 35.44 km
7 × 5 = 35 cm
Mastery
–4
–6
7 × 4 = 28 cm
–8 1. 12 cm 7 × 3 = 21 cm
–10 2. 28 cm 11. Using the concept of
2010 2011 2012 2013 2014 2015 3. 5.62 m Pythagorean triples,
Year 4. 540.83 km 3 + 4 + 5 = 12
(ii) Profit of RM11 million Self Practice 13.2a
7. (a) 12, 15, 15, 16, 17, 18, 21, 1. (a) Yes
24, 25, 27, 28, 30, 30, 31, (b) No
33, 34, 35, 36, 37, 37, 38, (c) Yes
324
Answers
14 Ans Math F1.indd 324 11/10/16 12:23 PM