Page 228 - Start Up Mathematics_5

3. (a) (i) (b) (iii) (c) (ii) (d) (ii) Let’s Evaluate
4. (a) No (b) Yes (c) Yes (d) No (e) Yes (f) Yes 1. Perimeter = 51.8 m, area = 147 m 2
2. 16 3. 324 cm 4. 35,840 cm 5. 421.875 dm 3
2
3
5. (a) acute angle (b) scalene triangle (c) 90°
3
6. (a) 4 cm (b) 5 cm (c) 6 cm 3
3
(d) parallel lines (e) perpendicular
Values and Life Skills

Scratch Your Brain ` 2,100
1. 24 triangles; 12 triangles 2. (b) 180°; Straight angle Scratch Your Brain
2
(c) 90°; Right angle (d) 150°; Obtuse angle 1. 42 cm 2. 13 cm 3. 6 4. 83
Chapter 14: Circle
Chapter 13: Perimeter, Area and Volume Let's Recall
Let’s Recall 1. (a) 6 cm (b) 10 cm (c) 12 cm

1. (a) 16 cm (b) 23 cm 2. (a) 5 cm (b) 9 cm (c) 11 cm
2. Students to do on their own. Exercise 14.1
3. (a) 14 units (b) 18 units (c) 24 units 1. Radii: OP, OT, OL, OM, OQ; Chord: SQ, PT, PQ, LM
Diameter: PQ, LM; Arcs: SL, LQ, QT, TM, PM
Exercise 13.1
2. Students to do on their own.
1. (a) 26 cm (b) 36 cm (c) 54 cm (d) 72 cm
Exercise 14.2
2. (a) 32 cm (b) 48 cm (c) 56 cm (d) 72 m
1. Students to do on their own.
(e) 84 m (f) 64 cm 2. 879.2 cm 3. 4.5 cm 4. 94.2 cm
3. (a) 15 cm (b) 32 cm (c) 48 cm (d) 74 m
5. 16.56 km 6. 45 cm
4. (a) 16 units (b) 24 units (c) 28 units (d) 36 units
Let’s Evaluate
(e) 42 units
1. (a) 8 cm (b) 7 cm (c) 14 cm
Exercise 13.2 2. (a) 16 dm (b) 27 mm (c) 4 m
1. (a) 39 (b) 36.5 (c) 24 (d) 21 (e) 47 (f) 19.5 3. (a) chord (b) diameter (c) arc (d) two
4. 12.56 cm 5. 15.99 inches
(g) Area covered by A = 13 square units 6. 94.2 cm 7. 87.92 m 8. 18.15 m
Area covered by R = 11½ square units
Area covered by T = 7 square units Scratch Your Brain
Total area covered = 31½ square units 28 gems
2. (a) 35 cm (b) 112 cm (c) 144 cm (d) 340 m 2 Chapter 15: Data Handling
2
2
2
3. (a) 36 cm (b) 81 cm (c) 144 cm (d) 441 m 2
2
2
2
Let’s recall
(e) 1,156 m 2
1. Mango 2. Grapes 3. 14 children
4. 12 m 5. 16 cm
4. 44 children
Exercise 13.3 Exercise 15.1
1. 3 m 2. 11 m 3. 2 m 4. 120 cm 2 1. (a) Shimla (b) Manali (c) 70 (d) 50
5. 36 cm 6. 8,800 tiles 7. 700 m 2 2. (a) May (b) February (c) 100 (d) 180
2
Exercise 13.4 Question 3, 4, 5 and 6 to be done by students on their own.
1. (a) 440 cm (b) 216 m (c) 20.25 cm 3 Exercise 15.2
3
3
(d) 11,000 cm 3 1. (a) School D: ` 18,000 (b) School E (c) ` 63,000
(d) School C
2. (a) 64 cm (b) 216 m (c) 15.625 dm 3
3
3
2. (a) This graph depicts the price of sugar since 2007.
(d) 1,728 cm (e) 8,000 cm 3 (b) Year 2010 (c) ` 30 per kg (d) ` 25
3
3. 10 m 4. 9 cm Question 3, 4 and 5 to be done by students on their own.

220