NCERT Class 8 Mathematics Solutions: Chapter 11 – Mensuration Exercise 11.3 Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Total Surface Area

1. Describe how the two figures below are alike and how they are different. Which box has larger lateral surface area?

Given Cylinder, and Cube

Answer:

Given,

Diameter of cylinder

Radius of cylinder

And Height of cylinder

Lateral surface area of cylinder

Now,

Lateral surface area of cube

So, the cube has larger lateral surface area.

2. A closed cylindrical tank of radius and height is made from a sheet of metal. How much sheet of metal is required?

Answer:

A Closed Cylindrical Tank of Radius

Given,

Radius of cylindrical tank

Height of cylindrical tank

Total surface area of cylindrical tank

So, metal sheet is required.