Page 128 - ADVANCED MATH F.5

Form Five Form Five

Answers to Exercise 6.8

π 4π π 3π 2π
1. (a) (b) (c) (d) − (e)
6 3 2 4 9
FOR ONLINE READING ONLY
3π 7π 9π
(f) (g) (h)
2 4 4
2. (a) 60° (b) 300° (c) 210° (d) 120− °

(e) 540° (f) 252° (g) 382.5° (h) 360°
π 11π π 5π π 3π 7π 11π
3. (a) , (b) , (c) , (d) ,
6 6 44 44 6 6
3π 5π π 4π
(e) , (f) ,
4 4 3 3
4. (a) 28.07° (b) 98.55° (c) 135.22− °
(d) 48.70− ° (e) 251.53° (f) 291.06− °

7ππ
5. (a) 1.14 (b) 0.559 (c) 1.48 6. ,
12 4
7π 11π 5π
7. (a) (b) (c)
8 36 9
2π 3π
8. (a) 0.71π (b) (c) 9. 360 , 135° °
3 4
10. (a) 64.3− ° (b) 270° (c) 114.6− ° (d) 439.3°

Approximating small angles
Teaching steps
1. Through discussions guide students how to apply the concept
of small angle approximations to approximate values of the
principal trigonometric functions.
2. Through discussion assist students how to perform Activity
6.4 in the Student’s Book and recognize geometrical properties
of small angles. Advise students to share their findings for
improvement.

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Mathematics for Advanced Secondary Schools

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ADVANCED MATH F.5 TG CHAPTERS.indd 122