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RS Aggarwal Solutions Class 8 Chapter-20 Volume and Surface Area of Solids (Ex 20A) Exercise 20.1

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Last updated date: 27th Mar 2024
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RS Aggarwal Solutions Class 8 Chapter-20 Volume and Surface Area of Solids (Ex 20A) Exercise 20.1 - Free PDF

The RS Aggarwal Class 8 Chapter 20 is important in the syllabus of Class 8. The PDF here is formulated to cover all the aspects of this Chapter and give a clear insight on how to learn the concepts and implement them in the questions. The experts at Vedantu have meticulously worked on this topic of RS Aggarwal Class 8 Chapter 20 Exercise 20A and came up with a short yet well-explained concept so that all the students can understand the concept easily and do not have any doubts further. Practice more questions from RS Aggarwal Class 8 Ex 20A for better scoring. Vedantu is a platform that provides free NCERT Solution and other study materials for students. You can also download NCERT Solution for Class 8 Science and NCERT Solutions for Class 8 Maths to help you to revise the complete syllabus and score more marks in your examinations.

Class 8 RS Aggarwal Exercise 20A Free PDF Download

The RS Aggarwal Class 8 Ex 20A has all the information needed to solve the questions and will help you very much at the time of your examination. If the PDF of the RS Aggarwal Class 8 20A solution is downloaded, It will be available to you all the time and can come in handy whenever you want to revise the topic. For all the students who want to excel in the examination, the solutions can be of great help. The important points and the formulae are listed very precisely and clearly. Our PDF solutions help students to assess their understanding of the topic better.


RS Aggarwal Class 8 Exercise 20A Solution

Chapter - Surface Area and Volume

The Surface Area and Volume Class 8 will cover the concepts of how to find the Volume and Surface Areas of certain solids. All the formulae related to the cube, cuboid, cylinder, cone, etc., are mentioned and the perfect examples illustrating these formulae are provided in a detailed manner. The main focus is on the Volume, lateral Surface Area, and total Surface Area. The application of using these formulae and finding the required elements is explained beautifully by our subject experts in the Surface Area and Volume Class 8.

 

Why is RS Aggarwal Class 8 Chapter 20 Important?

  • The PDF covers all the important formulae of the questions asked in the exam.

  • Important points and topics are explained easily.

  • The concepts are very well explained by the subject matter experts which will make understanding effortless.

  • The PDF can be downloaded easily and this will make the article very handy for last-minute revision.

  • The important questions are prioritized and listed in this article.

  • Our solutions come with Chapter-wise strategies for students to prepare for exams.

  • Practising RS Aggarwal Class 8 Exercise 20A Solution will help you build conceptual knowledge about the subject.

 

About the Chapter

This Chapter is primarily concerned with the Volumes and Surface Areas of a cuboid and a cube. Some applications of these formulae to simple problems from everyday life will be discussed as well. Students who are having difficulty solving problems can use RS Aggarwal Class 8. Our expert faculty team creates solutions with the utmost care to ensure that students understand the concepts clearly. Students can use the RD Sharma textbook as a reference source when studying for their board exams. This Chapter's solutions are available in PDF format and can be downloaded from the links provided below.

 

Volumes and Surface Areas of a Cuboid and a Cube Chapter 20 contains four exercises, and the RS Aggarwal Class 8 Solutions on this page provide answers to the questions in each exercise. Let's take a look at the concepts covered in this Chapter.

  • Cuboid.

  • Regions of space.

  • The Volume of a body-formed space region.

  • A Volume unit that is universally accepted.

  • The formula for calculating a cuboid's Volume.

  • A cube's Volume is its Volume.

  • Other Volume units are commonly used.

  • A cuboid's and a cube's Surface Areas

  • The Surface Area of a room's walls.

  • Problems of various kinds.

Any three-dimensional geometrical shape's Surface Area and Volume are calculated. The Surface Area of a given object is the Area or region occupied by the object's Surface. Volume, on the other hand, is the amount of space available in an object.

 

There are various shapes and sizes in geometry, such as the sphere, cube, cuboid, cone, cylinder, and so on. Each shape has both a Surface Area and a Volume. However, in the case of two-dimensional figures such as squares, circles, rectangles, triangles, and so on, we can only measure the Area covered by these figures and no Volume is available. Let us now look at the Surface Area and Volume formulas for various 3D shapes.

 

What Exactly is Surface Area?

The Area is the space occupied by a two-dimensional flat Surface. It is expressed in square units. Surface Area refers to the Area occupied by a three-dimensional object's outer Surface. It's also expressed in square units.

 

In General, There are Two Kinds of Areas:

  1. Surface Area Total

  2. Curved Surface Area/Lateral Surface Area

 

Surface Area Total

The total Surface Area includes the base(s) and the curved portion. It is the total Area covered by the object's Surface. If the shape has a curved Surface and a flat base, the total Area is the sum of the two Areas.

 

The Surface Area that is Curved

The Area of only the curved part of the shape, excluding its base, is referred to as the curved Surface Area (s). For shapes such as a cylinder, it is also known as lateral Surface Area.

 

What Exactly is Volume?

Volume is the amount of space that an object or substance takes up, measured in cubic units. Two-dimensional objects lack Volume and instead focus on the Area. The Volume of a circle, for example, cannot be found, but the Volume of a sphere can. Because a sphere is a three-dimensional shape, this is true.

 

RS Aggarwal Solutions Class 8 Ex 20A Chapterwise Weightage

RS Aggarwal Class 8 Exercise 20A solution is an important Chapter from the exam point of view. The formula of Volume of solids, LSA, and TSA of solids will be asked in the very short answer type format. There will be questions to solve for radius, the height of solids by giving some information about the solid in the short-answer type questions. The long answer type questions will have questions that will be application-based and involve real-time examples related to the formulae mentioned in the Chapter. We can expect 5-6 questions from RS Aggarwal Class 8 Chapter 20. The best way to improve your Maths score is to practice all these Class 8 RS Aggarwal Exercise 20A Questions daily.

FAQs on RS Aggarwal Solutions Class 8 Chapter-20 Volume and Surface Area of Solids (Ex 20A) Exercise 20.1

1. The length of a geometry box is 20 cm, its breadth is 5 cm, and has height of 1 cm. Find the volume of the geometry box.

Given,

 

The length of geometry box = 20 cm

 

The length of geometry box = 5 cm

 

The length of geometry box = 1 cm

 

The geometry box is in the shape of a cuboid.

 

So, the Volume of the geometry box is the same as the Volume of the cuboid.

 

The Volume of cuboid = lbh

 

Volume of geometry box = 20 cm * 5 cm * 1 cm = 100 cubic cm.

 

 Hence, the Volume of the cuboid is 100 cubic cm.

2. A cheese cube has a length of 5 cm and is further cut into smaller cubes which have a volume of 1 cubic cm each. Find the number of such smaller cubes obtained.

Given,

 

Length of larger cube = 5cm

 

The Volume of cube = side3

 

The Volume of the larger cube = 53 = 125 cubic cm.

 

Number of cubes obtained = (Volume of the larger cube)/(Volume of smaller cubes)

 

Number of cubes = 125/1 = 125

 

Hence, the number of cubes obtained after cutting them into smaller cubes is 125.

3. Where can I find useful Math study materials for Class 9?

Everything you need can be found on the Vedantu app or website. These resources are created by experts in the field, and the information is accurate and dependable. Students will be able to find revision notes, important questions, question papers, and much more! There are no fees or costs associated with these study materials. All students need to do is sign in, and then they can download whatever they want in pdf format. You can benefit from these free resources, which will undoubtedly help you ace your exams.

4. How can I do well in Class 8 Math?

The only way to do well in Class 9 Maths is to practise. Complete all of the Chapter exercises. This will enhance your problem-solving abilities as well as your speed and efficiency. Important formulas, definitions, and equations can be written down in a notebook and reviewed on a regular basis. Solve previous year's sample papers and question papers within a time limit. This will familiarise you with the paper pattern and question type, as well as help you improve your time management skills. Revise on a regular basis to ensure that you retain everything you've learned for a longer period of time.

5. A rectangular water reservoir contains 105 m3 of water. Find the depth of the water in the reservoir if its base measures 12 m by 3.5 m.

Given details are,

 

The capacity of water reservoir = 105 m3

 

Length of base of reservoir = 12 m

 

Width of base = 3.5 m

 

Let the depth of reservoir be ‘hm

 

l × b × h = 105

 

h = 105 / (l × b)

 

= 105 / (12×3.5)

 

= 105/42

 

= 2.5m

 

∴ The depth of the reservoir is 2.5 m