Page 253 - Math Genius C4

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\ 03-Oct-2025 Bharat arora P-9 Reader’s Sign _______________________ Date __________

Practice time 6e 3. (a) , OB OC OD
,
,
OA

1 4 4
1. (a) 4 (b) 1 (c) 1 (d) 1 (b) OA , OB , OC , OD , OE , OF , OG , OH
4 9 7

,
,
,
,
,
,
,
3 1 1 2 (c) PA PB PH PG DF CE CH DG

(e) 4 (f) 1 (g) 3 (h) 3

11 3 5 9 4. (a) P, Q, R (b) PQ PR, (c) QX , QY , PX (d) PR
2. (a) 3 (b) 0 (c) 1 (d) 2 think tank (Page 133)
11 8 17
Railway tracks, Edges of a ruler, Zebra crossing, Ruled paper, etc.
1 3 1
(e) 4 (f) 1 (g) 1 (h) 2 think tank (Page 134)
2 8 17
1. Partially open doors, scissors, hands of clock, cycle spokes, etc.
3. (a) 1 km (b) `37 (c) Reading, 1 hour 2. Parallel lines 3. Perpendicular lines
5
5 Practice time 7B
(d) Ridhima, km
8 1. (a) Intersecting (b) Parallel (c) Perpendicular (d) Intersecting
Mental Maths (Page 122) (e) Intersecting (f) Perpendicular

1. (c) 2. (b) 3. (d) 4. (a) 2. (a) arms: OA , OB ; Vertex: O; angle: ∠AOB; Acute

Chapter assessment (b) arms: BA , BC ; Vertex: B; angle: ∠ABC; Right

(c) arms: QP , QR ; Vertex: Q; angle: ∠PQR; Obtuse
1. (a) (iv) (b) (iii) (c) (i) (d) (iii) (e) (iii) (f) (ii)
2. (a) (v) (b) (iv) (c) (i) (d) (ii) (e) (iii) Practice time 7C
3. (a) > (b) = (c) > (d) < 2. (b), (c), (e), (f), (h)
3. (a), (b), (c), (e)
3 4 1
4. (a) (b) (c) 1 (d) 3
4 11 6 4. (a) AB , BC , CD , DA (b) XY , YZ , ZX
5. Both of them drank the same quantity. 6. 3 of salary (c) MN , NO , OP , PM (d) AB , BC , CD , DE , EA
5 5. (a) T (b) F (c) F (d) T (e) F
1 6 3 4 Practice time 7D
7. 8. or 9. 10. Shailja, 1 km
2 8 4 5 1. (a) False (b) True (c) True (d) False (e) True (f) True
Challenge Question (125) 2. (a) Centre: O, Radius: OA, OB, OC, Diameter: BC
1. Mira, Zoya 2. Ayaan 3. Yes; Kabir (b) Centre: O, Radius: OA, OB, Diameter: AB
3. (a) OA (b) AB
Model test Paper – 1 5. (a) 20 cm (b) 26 cm (c) 18 cm (d) 10 cm (e) 14 m
a. 1. (a) 2. (c) 3. (a) 4. (c) 5. (b) 6. (c) 6. (a) 6 cm (b) 20 cm (c) 13 cm (d) 32 cm (e) 40 cm
7. (c) 8. (a) 9. (a) 10. (b) Practice time 7e
B. 1. 4,00,000 + 10,000 + 3000 + 600 + 30 + 2 2. 1,00,000 1. Number Number Number Number
3. 13 4. zero(0) 5. 6 6. 1 Name of of of plane of curved of Number of
shape face(s) face(s) face(s) edge(s) vertices
C. 1. 7 necklaces 2. 5 or 1 3. 12,04,800 (a) Cube 6 6 0 12 8
10 2
(b) Cuboid 6 6 0 12 8
4. 45 chairs in each row, 57 chairs left. 5. 3950 kilometres (c) Cylinder 3 2 1 2 0
6. (a) 63 (b) 48 (c) 36 (d) Cone 2 1 1 1 1
Triangular 5 5 0 9 6
(e)
3 × 21 2 × 24 2 × 18 Prism
Square 5 5 0 8 5
(f)
3 × 7 3 × 8 2 × 9 Pyramid
2 × 4 3 × 3 2. (b), (c)
4. (a) 66 (b) 12 (c) 9
2 × 2 Mental Maths (Page 143)
1 2 3 4 5 6 7 1. No 2. Yes 3. No 4. Three 5. No
7. = = = = = =
3 6 9 12 15 18 21 Chapter assessment
1. (a) (iv) (b) (iv) (c) (iv) (d) (iii) (e) (ii) (f) (ii)
Chapter 7. Geometry (g) (iii)

Let’s ReCaLL 2. (a) A, B, O, D, E (b) BF (c) OA , OB , OD , OF (d) OE
1. (a) cone (b) cuboid (c) circle 3. (a) AD (b) AB and DC (c) parallel (d) AC and BD
4. 3(E, M, W)
Practice time 7a
5. (a) Centre (b) Radius (c) Radius (d) Diameter
1. (a) point (b) definite (c) one (d) no 6.

(a) Three (b) centre : O, Diameter: AB, Radii: OA and OB
2. (a) Point P (b) Line ST (c) Ray DC (d) Line segment UV (c) 14 cm
Mathematics-4 251