Page 298 - Start Up Mathematics_6

Fill in the Blanks (c)
1. equilateral 2. pentagon 3. 18° –3 –2 –1 0 1 2 3 4
4. Kite 5. edge
Answer in One Word or a Line (d) –7 –6 –5 –4 –3 –2 –1 0 1 2
1. 2 2. Infinite 3. 180°; Yes
4. 9 5. Yes 4. (a) –26 is to the left of –13 (b) –9 is to the left of 18
Let’s Evaluate (c) –29 is to the left of –13 (d) –100 is to the left of –67
1. (a) Infinite lines (b) one line (c) no line (d) one line 5. –8, –7 and –6 6. –13, –14 and –15
2. No, since it has infinite length. 7. (a) –4, –5 , –6, ..., –9 (b) –7 , –8, –9, ..., –12
3. (a) three right angles (b) four right angles (c) –1, –2 , –3, ..., –7 (d) –90 , –91, ..., –97
(c) one right angle (d) two right angles 8. (a) > (b) > (c) > (d) <
4. (a) two right angles (b) one right angle 9. (a) –11, –9 , –5, 0 (b) –123 , –98, –76, 121
(c) three right angles (c) –827 , –728, –287, –278
5. CB = 5 cm; Yes 10. (a) –99, –567 , –777, –990 (b) +876, 0, –706 , –901
6. acute, obtuse, zero, obtuse, reflex, straight, right, reflex, (c) 1, –167, –237 , –953
obtuse, acute 11. (a) 13 (b) 27 (c) 2 (d) 18
7. (a) straight (180°) (b) right (90°) 12. (a) –4 (b) –4 (c) right (d) right
(c) acute (45°) (d) reflex (270°)
13. (a) False, –170 is greater than –270
Thinking Skills (b) False, 0 is neither positive nor negative
1. No, since sum of two sides is not greater than the third (c) False, –5 is to the left of –1 on the number line.
side. (d) True
2. Yes 3. 8 cm 4. (a) only one (b) only one (e) False, the absolute value of an integer is always greater
5. An isosceles trapezium is one in which the non-parallel than or equal to the integer.
sides are equal; 5 cm
6. Since an octagon can be divided into 6 triangles. Hence, Exercise 6.2
sum of all the angles is 180 × 6 = 1,080°. 1. (a) 6 (b) 0 (c) –8 (d) –5
7. (a) x = 120°; y = 60° (b) x = 40°; y = 120° 2. (a) 4 (b) –11 (c) –6 (d) –3
3. (a) –260 (b) –100 (c) –565 (d) –595 (e) 0
Exemplar Problems 4. (a) –330 (b) –90 (c) +307 (d) –232 (e) –96
1. b 2. d 3. d 4. c 5. (a) –51 (b) +7 (c) –14 (d) –82
5. False 6. False Exercise 6.3
7. ∠APD; ∠APB; ∠BPC; ∠CPD 1. (a) –35 (b) 74 (c) –21 (d) –35
8. (a) A,B,C,D,E,F 2. (a) –2 (b) 89 (c) –94 (d) 87 (e) 92
(b) AB, AC, BC, BD, DF, FC, EF, ED, AE 3. –45 4. (a) < (b) <
(c) ABC, DEF, AEFC, AEDB, BDFC
Problems Related to Thinking Skills
1. –44 2. –100 3. 688 km
Chapter 6 4. –32 5. –6°C 6. 8,100 m
Exercise 6.1 Review Exercises
1. (a) Expenditure of ` 5,000 Multiple Choice Questions
(b) 250 km towards west of Delhi 1. c 2. a 3. c 4. a 5. b 6. c
(c) Early by 25 minutes Solve Mentally
(d) 200 m below sea level True or False
(e) Increase of 10 1. True 2. False 3. False 4. True
(f) 20°C above freezing point 5. True 6. True
2. (a) + ` 26,500 (b) + ` 3,000 (c) – ` 5,000
(d) + 100 m (e) – 3,000 m (f) – 10 m Fill in the Blanks
1. additive inverse 2. zero 3. 2 4. zero
3. (a)
–3 –2 –1 0 1 2 3 4 5. greater than or equal
Answer in One Word or a Line
(b) 1. –12 2. –5 3. 0 4. 1 5. No 6. – 7
–1 0 1 2 3 4 5 6 7

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