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# ICSE Class 9 Mathematics Revision Notes Chapter 21 - Solids

Last updated date: 14th Sep 2024
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## Revision Notes for ICSE Class 9 Mathematics Chapter 21 - Free PDF Download

Free PDF download of Class 9 Mathematics Chapter 21 - Solids (Surface Area and Volume of 3-D Solids) Revision Notes & Short Key-notes prepared by our expert Math teachers as per CISCE guidelines. To register Maths Tuitions on Vedantu.com to clear your doubts.

Students at Vedantu get a wide variety of study materials for ICSE according to the latest CISCE guidelines such as revision notes, solutions, solved questions, and sample papers for absolutely free of charge prepared by our expert teachers so you study smart! These can be downloaded easily by the Vedantu website or app. PDFs of ICSE Class 9 Mathematics Revision Notes for Chapter 21- Solids (Surface Area and Volume of 3-D solids) are also available for free at Vedantu.com. Get yourself registered in Maths tuitions provided by us to resolve your doubts and queries and see your performance improve day by day.

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## Introduction to the Chapter

Chapter 21- Solids starts with an introduction where students get a gist about what terms like solids, volume, and the surface area mean. In this chapter, students will be studying how length, breadth, and height are known as the 3-Dimensions and the shapes having these are known as the 3-Dimensional shapes of 3-D shapes such as cuboid and cube.

For cuboid, which is a 3-D shape with six rectangular faces, you will learn to calculate the Total surface area(TSA), lateral surface area(LSA), volume(V), and length of the diagonal(d). For the cube, which is a 3-D figure consisting of six square faces. Here also, we learn about TSA, LSA, V, and d and how to calculate them using an edge of the cube (as length = breadth = height in a cube known as an edge or a).

The chapter then moves on to the Application of these terms in real life. Such as, to Calculate the cost of an article. For instance, if we buy petrol we calculate the total cost with the help of volume, then the cost of the total petrol will be calculated as: The quantity of petrol bought × rate of petrol.

The chapter ends with the explanation of the term cross-section in brief and how when a body has a uniform cross-section, it can be used for calculating the volume, surface area( excluding cross-section), and the flow of water (or any other liquid).

### Topics in ICSE Class 9 Chapter 21 Mathematics?

Chapter 21- Solids (Surface Area and Volume of 3-D solids) of Class 9 mathematics for ICSE, consists of three exercises: 21(A) contains 16 questions, 21(B) contains 10 questions and 21(C) contains 10 questions each. There are six sections in chapter 21 of Class 9 Maths namely Introduction, Cuboid, Cube, Cost of an article, Cross-section, and flow of water(or any liquid) which must be practiced and revised by using the concise Mathematics Class 9 ICSE Solutions free PDF downloads provided by Vedantu.

## FAQs on ICSE Class 9 Mathematics Revision Notes Chapter 21 - Solids

1. From where can I find the best Revision Material for ICSE Class 9?

At Vedantu, we have everything you desire and need! The PDFs of revision notes and sample papers for Class 9 ICSE are prepared by our maestro teachers to make sure to help you gain knowledge and improve your study scores that too free of charge! These are easy to download from the website or app. The students just need to sign in to Vedantu.com and click on the PDFs they wish to download which are easily accessible to all. After this study them however you like whether offline or online.

2. Which Topics should be given more attention for ICSE Class 9 Mathematics Chapter 21?

In Chapter 21-Solids of Class 9 Mathematics, the students should make sure to study everything in detail but it is very crucial to remember the formulas regarding the total surface area, lateral surface area, volume, diagonal, and cross-section. Students must also practice how to apply them in theoretical questions or word problems (for example- how to calculate the flow of water) because it can be quite tricky to do so if one does not have enough practice and revision done.

3. What can I do to get better grades in ICSE Class 9 Maths?

The students should make sure that they have the right Revision notes, question banks, and sample papers for ICSE Class 9 Mathematics as they should not waste their time on long text-based answers which lead to nowhere. They should also keep in mind to study regularly and practice their basics as well as the complex parts. On practicing solved questions repeatedly and by taking the required sample tests, it is sure that a student will score good marks in ICSE Class 9 Maths.

4. Is studying ICSE Class 9 Mathematics Chapter 21 - Solids hard to understand?

In Chapter-21 named Solids(Surface Area and Volume of 3-D shapes), the students need to clear their doubts or the topics they are facing difficulty in. If the fundamentals of this chapter are not cleared, then not only it might be hard to understand Chapter-21 of class 9 ICSE but also the forthcoming topics in older classes too. Hence, the students are advised to get registered in Maths extra lecture sessions with Vedantu experts to score higher and better.