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

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APlusTopper.com provides step by step solutions for Selina Concise Mathematics Class 9 ICSE Solutions Chapter 21 Solids [Surface Area and Volume of 3-D Solids]. You can download the Selina Concise Mathematics ICSE Solutions for Class 9 with Free PDF download option. Selina Publishers Concise Mathematics for Class 9 ICSE Solutions all questions are solved and explained by expert mathematic teachers as per ICSE board guidelines.

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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

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**Solution 9: **The area of the playground is 3650 m

^{2}and the gravels are 1.2 cm deep. Therefore the total volume to be covered will be:

3650 x 0.012 =43.8 m

^{3}.

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

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**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

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**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

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**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.

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**Exercise 21(C)**

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