Page 298 - ICSE Math 8

35. According to the Euler’s relation, the sum of number of faces and vertices exceed the number of edges
by 2.
36. A vertex is a point where two edges of a polyhedron meet.
37. The line obtained when a paper is folded into two equal halves is called the line of symmetry.
38. An angle has no line of symmetry.
39. If the radius of a circle is 4 cm then a point which is at 4.5 cm from the centre will lie inside the circle.
40. The radius of a circle is always fixed.

41. The unit of perimeter is same as the given unit of length.
2
–4
42. 1 m = 10 hectare
43. The volume of a cube of side 3 cm is 30 cubic cm.
44. If the height of a cuboid is 5 cm and its volume is 440 cu cm, the area of its base is 88 sq cm.
45. The data arranged in increasing or decreasing order is called an arrayed data.
46. The data that can take decimal values also is called discrete data.
47. The experimental or empirical approach to probability emphasizes on the probability of an event based
on the actual occurrence.
48. In the theoretical approach to probability, the number of trials of an experiment is very small.

FILL IN THE BLANKS

p r p r
1. If and are two rational numbers, then + is also a rational number. This is known as _________
q s q s
property.
p r r p
2. + = + . This is known as _________ property of addition.
q s s q

()x m m n _________
3. = ()x ÷ ()x = ()x
()x n
–3
4. 10 = 1

5. A perfect square when divided by 3 or 4 leaves the remainder as _________ or _________.
6. If the units digit of a number is 1 or 9, then the units digit of the square of the number will be _________
7. The product of three identical numbers is called a _________
8. The cube root of 5,832 is _________

9. The generalized form of 68 is _________
ab − ba
10. In the generalized form of a 2-digit number, ab, we have = _________
a − b
11. The sets {a, e, i, o, } and {x : x is a vowel of English alphabet} are _________ sets.
12. The sets {t, u, v, w, x, y, z} and {o, p, q, r, s} are _________ sets.
13. ` 24 is _________% of ` 192.
14. 26% of _________ is 41.6.

15. Compare the ratios: 5 : 3 _________ 4 : 7
16. 1,504 g divided in the ratio 11 : 5 gives _________ and _________
17. If Honey can paint a wall in 10 days, then in 1 day _________ of the wall can be painted.
18. If a pipe empties a full tank in 5 hours, then the tank will be half empty in _________ hours.

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