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\\January 6, 2024 3:54 PM Surender Prajapati Proof 5 Reader _________________________ Date: ___________________74

(d) PA PB PQ, , (c) AB BC CD DA, , , (d) BD AC,
6. (a) parallel (b) parallel (c) intersecting (d) intersecting 3. AB BC CD DE AC AD AE BD BE CE (any five)
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(e) intersecting (f) coinciding            

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7. XY YZ 4. (a) a and , a and , a and , a and , a and , b and ,
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b and , b and , c and , c and , c and r
Practice Time 7B    
c
1. (b), (d) (b) b || and p || q
2. (a) ∠PQR (b) ∠XYZ (c) ∠LMN (d) ∠EFG 5. (a) ∠AOB + ∠BOC (b) ∠AOB + ∠COD
(c) ∠BOC + ∠COD (d) ∠AOB + ∠BOC + ∠COD
3. Arms Vertex Name of the angle      

6. (a) parallel line: l || n , Intersecting lines: l and pn, and p
,
(a) OP OT O ∠POT       
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(b) parallel line: qr|| , Intersecting lines: p and q r and s p and s

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
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(b) US UN U ∠SUN (c) parallel line: ab|| , Intersecting lines: a and  c b and c 
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,
(c) OT OP O ∠TOP 7. (a) DPQS, DSQR and DPQR
4. (a) ∠AOB, ∠BOC and ∠AOC (b) ∠PQR, ∠PQS, ∠SQR, ∠SRQ, ∠PSQ, ∠RPQ, ∠RSQ
(b) ∠RPS, ∠RPT, ∠RPQ, ∠SPT, ∠SPQ and ∠TPQ (c) PQ QS QR SR PS PR, , , , ,
5. (a) A, E, B, F, G, C (b) H, I (c) K, J (d) DPSQ and DQSR
Practice Time 7C Brain Sizzlers
1. (a) 25° (b) 60° (c) 140° (d) 165° (e) 220° (f) 90°  1 °
2
2. (a) 65° (b) 110° (c) 90° (d) 105° 1.   7  or 7.5° 2. 3
3. Do it yourself.
Practice Time 7D Model Test Paper – 1
1. (a) Acute angle (b) Right angle (c) Obtuse angle A. 1. (b) 2. (d) 3. (b) 4. (c) 5. (a) 6. (b)
(d) Straight angle 7. (d) 8. (c) 9. (b) 10. (c)
2. (a) Acute angle (b) Obtuse angle (c) Obtuse angle B. 1. obtuse 2. equilateral 3. circle 4. 12.3321.
(d) Straight angle (e) Right angle (f) Complete angle 5. 23
(g) Acute angle (h) Obtuse angle (i) Acute angle (j) Reflex angle C. 1. True 2. False 3. True 4. False 5. True
3. (a) Complete angle (b) Right angle D. 1. (a) Lakshadweep (b) Ten lakh fifty-five thousand four hundred fifty
(c) Straight angle (d) Reflex angle (e) Acute angle (c) 300000
(f) Reflex angle (g) Right angle (h) Acute angle (d) 12444464 = 10000000 + 2000000 + 400000 + 40000 + 4000 + 400 +
4. (a) ∠DEF – acute angle (b) ∠ABC – straight angle 60 + 4
(c) ∠XYZ – Right angle (d) ∠MNO – Reflex angle (e) Mizoram – 1,091,014; Puducherry – 12,444,464; Arunachal Pradesh
Practice Time 7E – 1,382, 611; Goa – 1,457,723; Nagaland – 1,980,602
1. (a)–(iii) (b)–(ii) (c)–(iv) (d)–(ii) (e)–(ii) (f) Mizoram (g) 55050
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2. (a) A, B and C 2. 3 3. 3 4. –10 5. 19.2 L
(b) ∠ABC or ∠CBA or ∠B, ∠BAC or ∠CAB or ∠A, ∠ACB or ∠BCA or ∠C 81
(c) AB, BC and CA 6. (a) ray (b) line (c) ray (d) line segment (e) ray
3. (a) Scalene triangle (b) Equilateral triangle (c) Isosceles triangle (f) ray
(d) Obtuse-angled triangle (e) right-angled triangle Chapter 8: Symmetry and Patterns
(f) Obtuse-angled triangle
Practice Time 7F Let’s Recall
1. (a) O (b) AB (c) OA, OB, OP (d) CD, AB 1. Do it yourself
(e) A, P, D, B, C (f) R, Q (g) M, N, O (h) 2 (i) chord 2. Do it yourself
(j) diameter AB
2. (a) False (b) True (c) False (d) True (e) False (f) True 3. (a) 12, 17, 22, 27, 32, 37, 42, 47 (b) 55, 52, 49, 46, 43, 40, 37, 34
3. (a) 5 cm (b) 6 cm (c) 22 mm (d) 16 cm 4. (a) ALL IS WELL (b) WORK HARD
4. (a) 3 cm (b) 4.5 cm (c) 11.5 mm (d) 8 mm Practice Time 8A
Practice Time 7G 1. (a) one (b) two (c) three (d) infinite (e) two
1. (b), (d) 2.
2. (a) –(iii) (b) –(iv) (c) –(i) (d) –(ii) (e) –(v) Do it yourself
3. (a) one (b) two (c) five (d) six (e) infinite
(f) two (g) six (h) two
3. 4. Do it yourself 5. (a) B, C, D, E (b) A, M, T, U, V, W, Y (c) H, I, O, X
6. Infinite plane of symmetry
Mental Maths Practice Time 8B
∠ABC = 45°, ∠PQR = 30°, ∠STU = 255°, ∠RST = 120°, ∠DEF = 90° 1. (a) flip (b) turn (c) slide (d) turn (e) turn (f) flip
∠PQR < ∠ABC < ∠DEF < ∠RST < ∠STU 2. (a) turn (b) slide (c) flip, turn 4. b and c 5. a, c, d
Chapter Assessment 6. (a) None (b) H, I, N, O, S, X and Z
(c)–(iv)
1. (a)–(iii) (b)–(iv) (d)–(i) (e) (iii) 1 3

2. (a) A, B, C, D, O (b) OA OB OC OD, , , (any three) 7. (a) turn clockwise or turn (anti-clockwise)
4 4
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