Page 253 - Math Genius C5

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Practice time 5C Practice time 6C
1. (a) 0.4 (b) 3.7 (c) 0.09 (d) 0.48 (e) 0.98 (f) 1.96 1. (a) 25° (b) 60° (c) 140° (d) 165° (e) 220° (f) 90°
(g) 2.13 (h) 1.4 (i) 23.5 (j) 8.07 2. (a) 65° (b) 110° (c) 90° (d) 105°
2. (a) 6 ( b) 35 ( c) 1 2 ( d) 5 1 3. Do it yourself.
10 100 10 10 Practice time 6D
9 45 3 2 1.
(e) 3 ( f) 3 ( g) 9 ( h) 27 (a) Acute angle (b) Right angle (c) Obtuse angle
10 100 100 10 (d) Straight angle
63 4 2.
(i) 26 ( j) 28 (a) Acute angle (b) Obtuse angle (c) Obtuse angle
100 100 (d) Straight angle (e) Right angle (f) Complete angle
Chapter Assessment (g) Acute angle (h) Obtuse angle (i) Acute angle (j) Reflex angle
1. (a) (iii) (b) (iv) (c) (ii) (d) (ii) (e) (ii) 3. (a) Complete angle (b) Right angle
2. (a) – (iv) (b) – (iii) (c) – (ii) (d) – (i) (c) Straight angle (d) Reflex angle (e) Acute angle
3. (a) Three hundredths (b) 6 tenths (f) Reflex angle (g) Right angle (h) Acute angle
(c) 3 tenths (d) 9 hundreds 4. (a) ∠DEF – acute angle (b) ∠ABC – straight angle
4. (a) 65.28 (b) 84.79 (c) 309.05 (c) ∠XYZ – Right angle (d) ∠MNO – Reflex angle
5 5. (a) South (b) North (c) East (d) West
5. E 6. Decimal: 0.5, fraction:
10 (e) East (f) South (g) South
7. smallest: 12.42, largest: 42.12 8. 10 cm 6. (a) 1 ( b) 1 ( c) 3 ( d) full
4
Mental Maths (Page 110) 7. Ice Cream Cart 2 4
5 2 3
1. (a) 10 (b) (i) , 0.5 (ii) , 0.2 (iii) , 0.3 Challenge Question (Page 128)
10 10 10
3
2. Ones . tenths Hundredths Decimals Practice time 6e
(a) 0 . 9 0.9 1. (a) (iv) (b) (ii) (c) (iv) (d) (ii) (e) (ii)
(b) 5 . 7 6 5.76 2. (a) Scalene triangle (b) Equilateral triangle (c) Isosceles triangle
(e) Right-angled triangle
(d) Obtuse-angled triangle
(c) 1 . 0 4 1.04 (f) Obtuse-angled triangle
(d) 5 . 4 7 5.47 Practice time 6F
1. (a) O (b) AB (c) OA, OB, OP (d) 2
Challenge Question (Page 111) 2. (a) False (b) True (c) False (d) True
1. 29.47 2. 3.62 3. (a) 5 cm (b) 6 cm (c) 22 mm (d) 16 cm
Chapter 6: Geometry 4. (a) 3 cm (b) 9 cm (c) 23 mm (d) 8 mm
Let’s ReCALL 2 2
1. Edge of a pencil, edge of a mobile phone, edge of a blackboard, edge of Mental Maths (Page 135)

a book, etc. ∠ABC = 45°, ∠PQR = 30°, ∠STU = 255°, ∠RST = 120°, ∠DEF = 90°
2. Pizza slices, traffic signs, sandwich slices, nachos, etc. ∠PQR < ∠ABC < ∠DEF < ∠RST < ∠STU
3. Blackboard, top of a table, ruler, playing card, etc. Challenge Question (Page 135)
4. Bangles, coins, whole pizza, dart board, etc.  1 °
Practice time 6A   7 
2
1. (a) (i) (b) (iii) (c) (ii) Chapter Assessment
2. (a) point (b) ray (c) line (d) two (e) Intersecting lines 1. (a) (iii) (b) (iv) (c) (iv) (d) (i)

(f) Parallel lines 2.
3. Do it yourself. (a) A, B, C, D, O (b) OA OB OC OD, , , (any three)

4. (a) Line AB or AB (b) Line QP or QP (c) AB BC CD DA, , , ( d) BD AC,

,
,
,
,
,
,
,
,
,
(c) Line segment ST or ST (d) Line EF or EF 3. AB BC CD DE AC AD AE BD BE CE (any five)
(e) Intersecting lines AB and CD (f) Parallel lines l and m or l || m 4. (a) a and b, a and c, a and r, a and p, a and q, b and r, b and p, b and q,
(g) Intersecting lines p and q ( h) Parallel lines s and t or s || t c and p, c and q, c and r, p and r, q and r.
5. (a) A, P, B, Q (b) l ( c) AB (b) b || c and p || q

(d) PA PB PQ, , 5. (a) ∠AOB + ∠BOC (b) ∠AOB + ∠COD
6. (a) parallel (b) parallel (c) perpendicular (c) ∠BOC + ∠COD (d) ∠AOB + ∠BOC + ∠COD
(d) perpendicular (e) perpendicular (f) coinciding 6. (a) parallel line: l || n, Intersecting lines: l and p, n and p

,
,
7. XY YZ XZ (b) parallel line: q || r, Intersecting lines: p and q, r and s, p and s
(c) parallel line: a || b, Intersecting lines: a and c, b and c
Practice time 6B 7. (a) DPQS, DSQR and DPQR
1. (b), (d) (b) ∠PQR, ∠PQS, ∠SQR, ∠SRQ, ∠PSQ, ∠RPQ, ∠RSQ
2. (a) ∠PQR (b) ∠XYZ (c) ∠LMN (d) ∠EFG (c) PQ QS QR SR PS PR, , , , ,
3. Arms Vertex Name of the angle (d) DPSQ and DQSR

,
(a) OP OT O ∠POT Model test Paper – 1

(b) US UN U ∠SUN A. 1. (b) 2. (d) 3. (b) 4. (c) 5. (a) 6. (b)
,

7. (d) 8. (c) 9. (b) 10. (a)
,
(c) OT OP O ∠TOP
B. 1. obtuse 2. equilateral 3. rectangle
4. (a) ∠AOB, ∠BOC and ∠AOC 4. 10 1 1 + 1 5. 23
++
(b) ∠RPS, ∠RPT, ∠RPQ, ∠SPT, ∠SPQ and ∠TPQ 10 100
5. (a) A, E, B, F, G, C (b) H, I (c) K, J C. 1. True 2. False 3. True 4. False 5. True
Mathematics-5 251