Page 233 - Maths Skills - 8

Answers 231

Assessment Time

A. 1. (ii) 2. (iii) 3. (iii) 4. (ii) 5. (iii)
B. 1. compound 2. inverse 3. the difference between their speeds 4. inversely 5. 12
C. 1. F 2. T 3. F 4. T 5. F
D. 1. (a) iii (b) ii (c) iv 2. (a) none of these (b) 9
E. 1. (a) 2. (a) F. 1. 28 km/h 2. 6 hours 15 minutes 3. 4 hours 48 minutes 4. 30 days
5. 1 hour 30 minutes 6. 300 m 7. 8.5 m/s or 30.6 km/h 8. 40 seconds

HOTS

1. 240 2. 168 3. A–24 days, B–40 days, C–30 days 4. 8 min.
Assessment - 3

PR T××
1. (b) 2. (d) 3. (b) 4. (a) 5. (c) 6. (a) 7. increase 8. 9. 4
100
10. Same 11. 12.5% 12. True 13. False 14. True 15. True 16. True 17. X + 150 = 600
18. 2x + 10x = 744 19. ` 17 per km 20. (c) 21. (b) 22. 8% 23. ` 8436.48, ` 936.48
24. ` 95, 68,125 25. 37 26. 30 days 27. 300 m 28. 22.72% 29. 36°, 72°, 108°, 144°

Chapter - 10: Understanding Quadrilaterals

Boot-up
A. 1. (iii) 2. (iii) 3. (ii) 4. (iii) 5. (i) B. 1. rhombus 2. parallelogram
3. square 4. square 5. square C. 1. T 2. F 3. T 4. T

Exercise - 10.1
1. (i) 11 (ii) 16 (iii) 20 2. (i) 8 (ii) 4 (iii) 5 (iv) 3 3. (i) 20 (ii) 12 (iii) 5
(iv) 8 4. (i) 120° (ii) 108° (iii) 45°

Exercise - 10.2
1. (i) 360° (ii) More than 180° (iii) 4, 4, 2 (iv) 360° 2. (i) 67.5° (ii) 70° 3. 86°, 129°
4. 120° 5. 45°,90°,90°,135° 6. 80°
Exercise - 10.3

1. 70°, 110°, 70°, 110° 2. 100°, 80°, 110° 3. 17 cm 4. (i) 40° (ii) 40° (iii) 50° (iv) 60°
5. 60°, 80°, 100°, 120° 6. (i) 75° (ii) 105° 7. length = 36 m, breadth = 24 m 8. 40 cm, 45 cm
9. 80°, 100°, 80°, 100° 10. 120°, 60°, 120°

Assessment Time
A. 1. (iii) 2. (ii) 3. (ii) 4. (iv) 5. (ii) B. 1. rectangle 2. square 3. kite 4. equal
5. supplementary or 180° C. 1. F 2. F 3. T 4. T 5. T D. 1. (iii) 2. (iii) 3. (iv)
E. 1. (d) 2. (b) F. 1. Do it yourself. 2. 8 3. 12 4. 90° 5., 6. Do it yourself.

HOTS
1. 20 m 2. 5 and 10 3. Do it yourself.

Chapter - 11: Mensuration

Boot-up
A. 1. (ii) 2. (iv) 3. (iii) B. 1. right angle triangle 2. circumference
3. 10000 4. parallelogram C. 1. F 2. T 3. F 4. F