## Selina Concise Mathematics Class 9 ICSE Solutions Solids [Surface Area and Volume of 3-D Solids]

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Selina ICSE Solutions for Class 9 Maths Chapter 21 Solids [Surface Area and Volume of 3-D Solids]

Exercise 21(A)

Solution 1: Therefore, the length, breadth and height of rectangular solid are Solution 2: Solution 3: Solution 4: Solution 5: Solution 6: Solution 7: Solution 8: Solution 9:
The area of the playground is 3650 m2 and the gravels are 1.2 cm deep. Therefore the total volume to be covered will be:
3650 x 0.012 =43.8 m3.
Since the cost of per cubic meter is Rs. 6.40, therefore the total cost will be:
43.8 x Rs.6.40 = Rs.280.32

Solution 10: Solution 11: Solution 12: Solution 13:
Let exterior height is h cm. Then interior dimensions are 78-3=75, 19-3=16 and h-3 (subtract two thicknesses of wood). Interior volume = 75 x 16 x (h-3) which must = 15 cu dm Solution 14: Solution 15: Solution 16: Exercise 21(B)

Solution 1:
The given figure can be divided into two cuboids of dimensions 6 cm, 4 cm, 3 cm, and 9 cm respectively. Hence, volume of solid Solution 2: Solution 3:
The cross section of a tunnel is of the trapezium shaped ABCD in which AB = 7m, CD = 5m and AM = BN. The height is 2.4 m and its length is 40m. Solution 4: Solution 5: Solution 6: Solution 7: Solution 8: Solution 9: Solution 10:    Exercise 21(C)

Solution 1: Solution 2: Solution 3: Solution 4: Solution 5: Solution 6: Solution 7: Solution 8: Solution 9: Solution 10: More Resources for Selina Concise Class 9 ICSE Solutions