Page 321 - ICSE Math 8

Practice Time 3. (a) (–1, 3) (b) (–4, 8) (c) (6, 0) (d) (0, 5)
1. 22 4. (a) (–8, 5) (b) (–4, –6) (c) (3, –7) (d) (–10, 2)
4. (a) (b) 5. (a) (3, 1) (b) (5, –5) (c) (–11, –8) (d) (–9, –12)
6. (a) (15, –6) (b) (–9, 7) (c) (4, 4) (d) (–10, –11)
7. B = (–4, –6), C = (4, 6) 8. 5

(c) Mental Maths
1. (a) False (b) False (c) True (d) False
2. (a) Reflection in
Point
5. (a) (i) Side (ii) Front (iii) Top x-axis y-axis origin
(b) (i) Top (ii) Side (iii) Front (2, 0) (2, 0) (–2, 0) (–2, 0)
(c) (i) Front (ii) Top (iii) Side

Think Smart (0, 2) (0, –2) (0, 2) (0, –2)
1. 6 faces, 9, edges 3. Square pyramid (–1, 3) (–1, –3) (1, 3) (1, –3)
Chapter 19 (b) Rotation about origin through an
angle of
Exercise 19.1 Point
90°
90°
1. (a) one (b) no (or zero) (c) circle (d) no 180° (anticlock- (clock-
2. (a) (b) (c) wise) wise)
(1, 0) (–1, 0) (0, 1) (0, –1)
(–2, 3) (2, –3) (–3, –2) (3, 2)
(–3, –3) (3, 3) (3, –3) (–3, 3)

Practice Time
(d) (e) (f)
1. (a) (b)

3. (a) (b) (c) (d)
(c) (d)

4. 5.

2. (a) (b)
4 cm 4 cm 30°

4 cm 60° 30°
6. 7. A (c) (d)

P Q
3. P 4. A
45° 45° 75°
B C 4.7 cm
Exercise 19.2 4.7 cm
1. (a) (3, –4) (b) (–2, 1) (c) (1, 5) (d) (–10, –7)
2. (a) (–2, 3) (b) (6, 1) (c) (–8, 0) (d) (5, –7) Q R B C

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