# CBSE Class 8 Maths Revision Notes Chapter 11

## CBSE Class 8 Mathematics Revision Notes Chapter 11 – Mensuration

In these Class 8 Mathematics Chapter 11 Notes, students will learn about Mensuration. In addition, in these Class 8 Mathematics Chapter 11 Notes, students will get to know the important details of the chapter that are essential for their final examination. Along with Class 8 Mathematics Chapter 11 Notes, Extramarks will provide students with essential questions for quick and instant preparation. Moreover, Class 8 Mathematics Chapter 11 Notes will be a student’s last-minute revision guide, providing all the necessary information. These notes are based on the CBSE Syllabus.

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Perimeter: The length of a simply closed figure boundary is its perimeter.

Rectangle = 2(l+b)

Square = 4a

Parallelogram = 2 (Sum of adjacent sides)

• Area: The size of territory encompassed by a straightforward closed figure is known as its area.
• A trapezium’s area is determined by dividing the sum of the lengths of its parallel sides by the perpendicular distance between them.

Area of a rhombus = 12 the product of its diagonals.

Triangle = 12 × base × height

Diagonal of:

Rectangle = l²+b²

Square = 2a

The total of a solid’s face areas makes up its surface area.

Surface area of cuboid = 2(lb+bh+lh)

Surface area of cube = 6l²

Surface area of a cylinder = 2r(r+h)

The volume of a solid will be the amount of space it takes up.

The volume of:

A cuboid = lbh

A cube = l³

A cylinder = r²h

A few basic measurements are as follows.

• 1cm³=1mL
• 1L=1000cm³
• 1m³=1000000cm³

= 1000L

## Revision Notes For CBSE Class 8 Mathematics Chapter 11 – Free PDF Download

### Download Mathematics Class 8 Mensuration Notes – Free PDF

Extramarks is a platform where students can get free Revision Notes for Class 8 Mathematics Chapter 11 and other study materials. Students can easily download these Class 8 Chapter 11 Notes and use them as future references for their ease. If you use the Mensuration Class 8 Chapter 11 NCERT Solutions and the Mensuration Class 8 Notes provided by Extramarks, studying Class 8 Chapter 11 will become much simpler for you.

Extramarks’ Mathematics Class 8 Mensuration Notes are crucial for aspiring students who want to excel in their classes and get good grades. You can prepare for your upcoming Class 8 examination and other competitive exams like the Olympiad by using these revision notes for Class 8 Mathematics Chapter 11. In addition, to learn about various shortcut methods that assist you in solving numerical problems step-by-step, choose online Mathematics Class 8 Mensuration Notes.

### With just one click on the PDF link below, you can download the revision notes for Class 8 Mathematics Chapter 11 in its entirety and access them whenever and wherever you like. By mastering the revision notes for Chapter 11 Mensuration, you can understand the types of questions and the amount of time needed to solve them. These notes will help you perform well on your test and understand the chapter better. A Quick Glimpse Of  Class 8 Chapter 11 Mensuration

You will be introduced to various geometrical figures and their parameters in these Chapter 11 Mensuration Notes. These parameters include perimeter, area, surface area, length, volume, lateral surface area, etc. You must have learned in your previous classes that a closed figure’s area is the area it covers, and the perimeter of a closed figure is the distance around its boundary. You should be able to calculate the areas and perimeters of various plane figures, such as circles, triangles, and rectangles. Additionally, you must be familiar with the formulas used to determine the area of borders or pathways in a rectangular shape.

In this chapter on measurement, you will learn how to calculate the area and perimeter of other closed figures, such as quadrilaterals. You will learn how to determine the surface area and volume of solids like cylinders, cuboids, and cubes.

Students should be familiar with the key formulas and concepts to successfully complete the numerical questions related to mensuration in their CBSE Class 8 exams.

These notes contain all the topics in the NCERT books concisely. Download the Class 8 Mathematics Chapter 11 Notes on this page to improve your exam results. Once you go through these notes, you can easily solve CBSE sample papers to test your understanding. These notes also contain CBSE extra questions that will further help the students in assessing themselves.

### Topics And Subtopics Covered In Chapter 11 Mensuration

Here are the topics and sub-topics covered in Chapter 11 – Mensuration.

### Mensuration Important Formulas

Some essential mensuration formulas are discussed below.

• Area of Trapezium:

12 of the sum of the length of parallel sides * Perpendicular distance between them

• Surface Area of Cuboid: 2 (LB + BH + HL)  or  2 (Length * Breadth + Breadth * Height + Length * Height )
• Surface Area of Cube: 6 * Side²
• Surface Area of Cylinder: 2πr( Radius + Height)
• Volume of Cuboid:  LBH or (Length  * Breadth * Height)
• Volume of Cube: Side³
• Volume of Cylinder: r²h

In the above formula

H = Height of cylinder

Download our Class 8 Mathematics Revision Notes Chapter 11 PDF for free to get a detailed view of this chapter.

### Key Highlights of CBSE Class 8 Mathematics Revision Notes Chapter 11

Here are some of the major points of the CBSE Class 8 Mathematics Revision Notes Chapter 11:

• By using these CBSE Revision Notes,  students can easily understand, apply, and revise all the key ideas in Chapter 11.
• The revision notes provide clear and concise definitions of the important topics covered.
• Understanding all the key ideas and formulas from the chapter, which are presented in the right order in the Mathematics Class 8 Mensuration Notes, will save you a great deal of time.
• These mensuration notes for Class 8 Mathematics from Extramarks include many significant suggestions for successfully solving mensuration numerical problems.
• Extramarks’ subject specialists create these notes in a tidy and organised manner that makes them appealing and easy for students to learn.

These CBSE Revision Notes are made according to the CBSE Syllabus. The questions in these notes are based on CBSE Past Years’ Question Papers. In addition, these notes contain Important Questions and Formulas to help students achieve better marks in their examinations.

## FAQs (Frequently Asked Questions)

### 1. What do you mean by mensuration?

The practice of measuring the area and perimeter of different shapes is known as mensuration. The shapes include triangles, rectangles, trapeziums, squares, etc.

### 2. Calculate the height of a cuboid with a base area of 180 cm² and a volume of 900 cm³.

The volume of cuboid = base area × height

900 = 180 × height

So, height = 900180 = 5 cm

### 3. The area of a rhombus is 16 cm², and the length of one of its diagonals is 4 cm. Calculate the length of the other diagonal.

Area of rhombus = 12  × d1 × d2

⇒ 16 = 12  × 4 × d2

So, d2 = 324 = 8 cm

### 4. The parallel sides of a trapezium is 12 cm and 20 cm. Find out its area if the distance between the parallel lines is 15 cm.

Area of trapezium = 12  × perpendicular distance between parallel sides × sum of parallel sides

= 12  × 15 × (12 + 20)

= 12  × 15 × 32

= 15 × 16

= 240 cm²

### 5. The ratio of the length and breadth of a rectangle is 4 : 3. If its perimeter is 154 cm, find its length and breadth.

Let the length of the rectangle be 4x cm and that of breadth = 3x cm

Perimeter = 2(l + b) = 2(4x + 3x) = 2 × 7x = 14x cm

14x = 154

x = 11

Length = 4 × 11 = 44 cm

Breadth = 3 × 11 = 33 cm