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RD Sharma Class 8 Solutions Chapter 21 - Volumes Surface Area Cuboid Cube (Ex 21.1) Exercise 21.1

Last updated date: 25th Feb 2024
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RD Sharma Class 8 Solutions Chapter 21 - Volumes Surface Area Cuboid Cube (Ex 21.1) Exercise 21.1 - Free PDF

Free PDF download of RD Sharma Class 8 Solutions Chapter 21 - Volumes Surface Area Cuboid Cube Exercise 21.1 solved by Expert Mathematics Teachers on All Chapter 21 - Volumes Surface Area Cuboid Cube Ex 21.1 Questions with Solutions for RD Sharma Class 8 Maths to help you to revise the complete Syllabus and Score More marks. Register for online coaching for IIT JEE (Mains & Advanced) and other engineering entrance exams.

Class 8 RD Sharma Textbook Solutions Chapter 21 - Mensuration II (Volumes and Surface Areas of a Cuboid and a Cube)

In Chapter 21 - Mensuration II (Volumes and Surface Areas of a Cuboid and a Cube), several exercise questions with solutions for RD Sharma Class 8 Maths are given to help the students understand the concepts better. 

We have provided step-by-step solutions for all exercise questions given in the pdf of Class 8 RD Sharma Chapter 21 - Mensuration II (Volumes and Surface Areas of a Cuboid and a Cube). All the Exercise questions with solutions in Chapter 21 - Mensuration II (Volumes and Surface Areas of a Cuboid and a Cube) are given below:

Exercise 21.2

Exercise 21.3

Exercise 21.4

At Vedantu, students can also get Class 8 Maths Revision Notes, Formula, and Important Questions, and also students can refer to the complete Syllabus for Class 8 Maths, Sample Paper, and Previous Year Question Paper to prepare for their exams to score more marks.

This chapter is mainly concerned with the volume and surface area of cuboids and cubes. A few applications of these formulae to solve problems that arise in everyday life will also be discussed. Students who are having difficulty solving their problems can use RD Sharma Class 8. Solutions are developed by our faculty experts with great care to help students comprehend the concepts in a way that is easy for them to understand. Students can utilise RD Sharma's textbook as an aid in preparing for the board exams. While this chapter may be a bit difficult, however, this simplified RD Sharma solution we offer to students includes clear explanations and exercises that can assist them in understanding the concepts with ease. This will also assist them to improve their maths abilities and solve even the most difficult questions in this chapter.


Chapter 21 - Mensuration II (Volumes and Surface Areas of the Cuboid and the cube) includes four exercises, and those RD Sharma Class 8 Solution included in this page give answers to the problems that are asked during each of the exercises. Let's take an overview of the concepts covered in this chapter.

  • Cuboid.

  • Space regions.

  • The size of that is created by the body.

  • A volume standard unit.

  • The formula to determine the cuboid's volume.

  • The size of the cube.

  • Other common units of volume.

  • Cuboids have surfaces as well as cubes.

  • The area of the walls of an area.

  • Miscellaneous problems.


This Chapter in exercise 21.1 in particular deals with concepts and numericals related to Volume of cube and cuboid. The volume of the cube is given by a^3 , where a is the side of the cube and Volume of cuboid is given by Length x Breadth x Height.

Here are some tips on how to find RD Sharma Class 8 Solutions Chapter 21 - Volumes Surface Area Cuboid Cube:

Work on the Basics - It is important to work on RD Sharma Class Chapter 21 - Volumes Surface Area Cuboid Cube basics before you move to more difficult RD Sharma Class Solutions. Strong basics make the foundation for more difficult RD Sharma solutions. RD Sharma Solutions can be tricky and complex at times. However, with practice and patience, you can master them.

Learn the Rules - There are different types of RD Sharma Class Solutions and we must know all about them so as not to get stuck in a problem. RD Sharma Class Solutions follow certain rules, and it is important to be aware of these so that you can apply them while working on RD Sharma problems.

Practice Makes Perfect - The only way to get better at RD Sharma is by practising as much as possible. There are plenty of RD Sharma exercises available online which can help you practice different types of RD Sharma Class Solutions. RD Sharma problems test your reasoning abilities and the more RD Sharma exercises you attempt, the better prepared you will be for any RD Sharma questions that may come up in an exam. RD Sharma Solutions are important to learn because they will help you in RD Sharma exams, and also in other RD Sharma courses.

Keep Calm Under Pressure - RD Sharma Class Solutions become difficult due to the pressure that is put on RD Sharma students. If you can keep your cool and think through the RD Sharma solution methodically, there is a good chance that you will find the answer. RD Sharma Solutions can be tricky but if you take it step by step, without rushing or getting overwhelmed, then chances of errors decrease and your RD Sharma score goes up!

Read RD Sharma Solutions as Many Times as Possible - RD Sharma Class is full of complex RD Sharma Solutions which can make students feel overwhelmed. However, RD Sharma Solutions are not as complicated if you read them carefully. It is important to learn RD Sharma Class Techniques and RD Sharma Solutions by heart but it's also important that you understand the logical reasoning behind how they work. A lot of RD Sharma students make silly mistakes because they don't fully understand what is being asked in an RD Sharma problem, or RD Sharma solutions.

Make an RD Sharma Study Plan and Revise Regularly - RD Sharma problems are tough to crack if you do not know what you're doing. While we must work on our RD Sharma Class basics, we should also spend time learning other RD Sharma techniques as well as the theory behind them. RD Sharma Solutions can be tricky, but if you have a sound RD Sharma study plan in place and revise regularly, then you will be able to master RD Sharma Class.

Use RD Sharma Notes and Textbooks - RD Sharma Solutions are usually more clear when we see them in the RD Sharma textbook or RD Sharma notes. This is because the RD Sharma solutions have been simplified and explained better in RD Sharma notes or RD Sharma textbooks, compared to RD Sharma's class.

The best way for students to do RD Sharma Solutions for surface areas and volumes is by practicing them regularly until they memorize all of the rules that need to be followed when working out RD Sharma problems. RD Sharma solutions can be difficult to understand at the beginning, but if you practice them regularly then they will become much easier in RD Sharma Class!

FAQs on RD Sharma Class 8 Solutions Chapter 21 - Volumes Surface Area Cuboid Cube (Ex 21.1) Exercise 21.1

1. What are some RD Sharma Class 8 surface area and volume solution sources that I should use?

The RD Sharma textbook for RD Sharma class is RD Sharma Notes which contains all of the important formulas, RD Sharma techniques, and RD Sharma Solutions needed for RD Sharma exams. Other RD Sharma textbooks which are popular amongst RD Sharma students include RD Sharma Lecture, RD Sharma Practice, and RD Sharma PDF.

2. What should I do if I find a surface area and volume problem from RD Sharma difficult?

If you get stuck on a problem, the best thing is to put it aside and move on. RD Sharma problems are tough, so there's no shame in getting stuck! It is better to revise the concept. RD Sharma solutions can be frustrating if you're not sure where to start, but don't let that discourage you from your RD Sharma Class mission of mastering RD Sharma Solutions.

3. What is cube and cuboid and how to calculate their volumes?

A cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex. It has 6 faces, 12 edges, and 8 vertices.

If “a” is the edge of the cube , then its volume is given by a3.

A cuboid is a convex polyhedron bounded by six quadrilateral faces. Its volume is calculated by the Formulae : LxBxH , where 

L= Length of the cuboid

B= Breadth of the cuboid

H= Height of the cuboid.