Page 226 - Mathematics_Form_Two

Chapter name

Exercise 8�4 Exercise 8�5

1.
sinθ = 3 1. (a) 0.8290
5 (b) 0.7265

2. 53 (c) 0.9994
9 (d) 0.4344
Mathematics for Secondary Schools tan 4. 4.326A ≈ 0.3744 2. (a) y = 63 32'°
6
3.
(e) 0.4417
2
(f) 2.7475

78 16'°
sinθ ≈
5.
(d) y =
sni
36 41'°
9
7. 0.8θ =
cos 6. θ = 1 57 (b) y = 66 25'°
(e) y =
r
sinx (c) y = 56 19'°
8. =
q
12 5 (f) y = 18 26'°
nθco
10. =sθ =
si FOR ONLINE READING ONLY
,
1 3 13 3. (a) x = 9.2cm, y = 7.7cm
1 (b) x = 1.7cm, y = 2.6cm
11. =
sinβ
2 (c) x = 0.5m, y = 0.9m
12.
cosα = 39 (d) x = 8.3cm, y = 5.6cm
8 (e) x = 1.3cm, y = 4.2cm
1 3 (f) f = 5.5cm
tanλ
13. =
7 (g) r = 36.6cm, s = 52.8cm
55 (h) x = 27.7cm
14. ±
8
4. (a) a = 9.6cm
15. ±2 2
(b) t = 4.5cm

cos 16. 0.1732θ = (c) c = 42 17'°
°
(d) y = 59 14′
17. ± 1.4284
(e) n = 116 34′
°
sin 18. 0.9272P = (f) x = 35 ,° a = 21 48 , ′ α = 13 12′
°
°
19. ± 0.4663 (g) x = 32.8cm, y = 39.0cm

20. sinθ = 0.9511, tanθ = 3.0779 (h) p = 12.9cm, x = 11.9cm

220
Student's Book Form Two

11/10/2024 20:15:15
MATHEMATIC F2 v5.indd 220
MATHEMATIC F2 v5.indd 220 11/10/2024 20:15:15