Question

7. The length, the breadth and the height of a cuboid are in the ratio 5:3:2.

If its volume is 240cm3, find the total surface area. [5]

8. The total surface area of a cube is 216cm2, find its volume [5]

9. Find the volume of a cuboid whose length is 15cm, breadth is 10cm

and height is 8cm. [5]

10.A wall 9m long, 6m high and 20cm thick is to be constructed, using

bricks of dimension 30cm, 15cm and 10cm. How many bricks will be

required?​

Answer 1

Answer:

Find the volume and the total surface area of a cuboid, whose :

(i) length = 15 cm, breadth = 10 cm and height = 8 cm.

(ii) l = 3.5 m, b = 2.6 m and h = 90 cm,

Solution:

Selina Concise Mathematics Class 8 ICSE Solutions Chapter 21 Surface Area, Volume and Capacity (Cuboid, Cube and Cylinder) Ex 21A 1