Page 237 - Maths Skills - 8
P. 237
Answers 235
HOTS
1. Do it yourself. 2. 9 3. 1 (Hint: Ordinary year has 365 days) 4. (i) 7 (ii) 23
11 7 90 90
Chapter - 13: Introduction to Graphs
Boot-up
A. 1. (i) 2. (iii) 3. (iii) 4. (iv) B. 1. infinite 2. parallel
3. 0 4. Same C. 1. True 2. True 3. True
Exercise - 13.1
1. (i) IV (ii) IV (iii) I (iv) III (v) II 2. Do yourself
3. (i) I (ii) I (iii) I (iv) II (v) IV (vi) III
4. (i) (ii) Y
Y 6
6 5 Parallelogram
5 B C 4
4 3 J M
3 Rectangle 2
2 1 K L
1 D X
A –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8
–6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 X –1
–1 –2
–2 –3
–3 –4
–4 –5
–5 –6
–6
(iii) Y 5. (i) L: (– 4, – 3) (ii) S: (2, 2) (iii) A: (– 4, – 2)
5
(iv) R: (1, – 4) (v) M: (– 2, 6)
4
Triangle
3 6. Y
6
2
W Z Y 5
1 4
X X
0 3
–5 –4 –3 –2 –1 1 2 3 4 5 6
–1 2
–2 1
X
–3 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8
–4 –1
–2
–5 –3
–4
–5
–6
Exercise - 13.2
Do it yourself.
Exercise - 13.3
1. (i) 4th week (ii) 1st and 2nd week (iii) 2 cm 2. (i) Plot the graph taking suitable scale
(ii) Between 11:10 a.m. to 11:20 a.m. and 10:40 a.m. to 10:50 a.m. (iii) 16.66 m/s (iv) 38 km/hr or 10.5 m/s
3. (i) Distance travelled between C to E = 15 km (ii) 2 m/s (iii) The speed of the car is zero between 0 to 20 seconds