Page 172 - Maths Skill - 6

170 Maths

Chapter – 8: Playing with Construction

Boot-up

A. 1. (ii) 2. (i) 3. (i) 4. (ii) 5. (i) 6. (iii) B. 1. chord 2. longest 3. circumference
4. half 5. diameter C. 1. False 2. True 3. True 4. False

Exercise - 8.1

Do it yourself
Assessment Time

A. 1. (iii) 2. (i) 3. (ii) 4. (iii)
B. 1. protractor 2. compass 3. geometry kit 4. ruler 5. protractor C. Do it yourself

Chapter - 9: Symmetry

Boot-up

A. 1. (iii) 2. (ii) 3. (iv) 4. (iii) 5. (i) B. 1. 1 2. 0, 8 3. 3 4. 7 (1, 2, 4, 5, 6, 7, 9)
5. 7 (A, M, T, U, V, W, Y) C. 1. True 2. False 3. True 4. False 5. True

Exercise - 9.1

3. (i) l 1 (ii) m , m , m and m 4 6. (i) four (ii) circle (iii) scalene (iv) two 9. Draw perpendicular bisector of PQ
3
1
2
Exercise - 9.2
Do it yourself

Exercise - 9.3
1. (i) Yes (ii) Yes (iii) Yes (iv) Yes (v) No (vi) No (vii) Yes (viii) No
2. (i) 4, 90° (ii) 5, 72° (iii) 2, 180° (iv) 4, 90° (v) 2, 180° (vi) 3, 120°

Assessment Time
A. 1. (iii) 2. (iii) 3. (i) 4. (iii) B. 1. Rectangle 2. One 3. axis of symmetry 4. reflection 5. six
C. 1. False 2. False 3. True 4. True 5. True D. Do it yourself
E. 1. (d) 2. (d) 3. (c)

F. 1.

F and J are not symmetrical.
2. (i) m (ii) l (iii) l, m, n, p (iv) l, n (v) l (vi) l
3. (i) 3 (ii) 5 (iii) 6

HOTS

1. The digit 3 has only 1 line of symmetry, i.e., a horizontal line, 0 has 2 lines and the numeral 30 has 1 line of symmetry.
2. 0, isosceles trapezium. 3. Yes, a line of symmetry sometimes acts as a mirror reflecting the figure to form an image.
4. Angle bisector ; if arms are unequal, it has no effect on angle.