NCERT Class 8 Mathematics Solutions: Chapter 11 –Mensuration Exercise 11.3 Part 4

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Total surface area

Total Surface Area

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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



Diameter of cylinder

Radius of cylinder

And Height of cylinder

Lateral surface area of cylinder


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?


A Closed Cylindrical Tank of Radius


Radius of cylindrical tank

Height of cylindrical tank

Total surface area of cylindrical tank

So, metal sheet is required.