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Chapter 8: Playing with Constructions
Let’s Recall (c) (d)
2. (a) Bangle (b) Chessboard (c) TV screen
Practice Time 8A
1. (a) Open curve (b) Closed curve (c) Open curve 3. A, H, I, M, O, T, U, V, W, X, Y
(d) Closed curve (e) Closed curve
5. (d)
4. (a) (b) (c)
Chapter Assessment
A. 1. (d) 2. (d) 3. (b) 4. (b) 5. (a)
6. (c) 7. (d) 8. (b) 5. CONFUSION CONFUSION
B. 1. (a) 2. (d) 3. (d)
C. 1. T 2. T 3. F 4. T
D. 3. Rectangle: A, D, F, G; Square: B, C
6. (a) (b) (c)
Chapter 9: Symmetry
Let’s Recall
1. (b), (d)
7. (a) ; 6 (b) ; 7
2. (a) (b) (c) (d)

3. (a), (c)
Think and Answer (c) ; 4
A rhombus has two lines of symmetry because of its unequal angles,
allowing symmetry only along the diagonals.
A square has four lines of symmetry because all angles are equal, Maths Connect
allowing symmetry along both the diagonals as well as the mid-points of
its sides. 1. Yes; 3 lines of symmetry.
Practice Time 9A
2. Yes; angles of rotational symmetry 120°, 240°, 360°
1. Symmetrical: (a), (e); Asymmetrical: (b), (c), (d)
Practice Time 9C
2. (a) (c) (d) (e) 1. (a) 180°, 360° (b) 360° (c) 120°, 240°, 360°
2. I, S
3. S
3. (a) 2 (b) 2 (c) 2 (d) 4 (e) 2
(f) 4 (g) 3 (h) 5
4. (a) (b) (c) (d)
4. H, O 5. Yes, 4 6. , [Answer may vary]
Square Star
7. Yes
5. 5; 6. l 8. Yes, order of rotational symmetry of each letter is 2.
9. (a) 2 (b) 2 (c) 5 (d) 45°
10. 24 lines of symmetry, 24 angles of symmetry.

7. (a) (b) (c) Practice Time 9E
1. (b) 2. (c) 3. Square and Rhombus
Think and Answer
4. No, 5. Octagon, square and octagon
The image formed was 2 m away from us. If you move towards the mirror,
the image comes closer to you.
6. Heptagon, Pentagon 7. (c)
Practice Time 9B
Brain Sizzlers
1. (a) → (i) (b) → (i) (c) → (iii)
AMTUVWY08
Chapter Assessment
2. (a) (b)
A. 1. (a) 2. (b) 3. (c) 4. (d) 5. (b)
6. (a) 7. (d) 8. (d) 9. (a) 10. (a)

321 Answers