# CBSE Class 7 Maths Revision Notes Chapter 11

## CBSE Class 7 Mathematics Chapter 11 Revision Notes – Perimeter and Area

Chapter 11 of Mathematics in Class 7 ‘Perimeter and Area’ deals with the advanced concepts of Geometry. Geometry is a field of study that deals with the area, perimeter and other related concepts of shapes that we see and observe in our environment. These shapes play a vital role in our life and hence it is essential to understand ways to measure them. Hence, this chapter will cover different theories around area and perimeter of different shapes such as triangle, parallelogram, rectangle, square, circle, etc. Also, when it comes to different shapes, it is very essential to know about the different formulas as well as units.

Thus, to help students understand and consolidate their learning from the chapter “Perimeter and Area”, the experts at Extramarks have crafted the Class 7 Mathematics Chapter 11 Revision Notes. The use of simple language and easy examples makes it easier for the students to understand the key concepts of this chapter.

For better understanding and command of the chapter “Perimeter and Area”, it is recommended for the students to study the Class 7 Mathematics Chapter 11 Revision Notes along with the NCERT books. To score good marks, it is thus necessary for the students to regularly revise the notes of Class 7 Mathematics Chapter 11. Also, the other revision notes by Extramarks need to be revised.

### Perimeter and Area Notes

• The area of the region or a plane will be measured in sq. mt. or square metres.
• The area of a closed shape is part of the plane surface which is also in closed form. However, the distance that surrounds it is the perimeter.

Calculating the Area of a Rectangle and Square:

• Area of a Square = side x side
• Perimeter of a Square = 4 x side
• Area of a rectangle = length x breadth
• Perimeter of a rectangle = 2x(length + breadth)

### Area of a Triangle:

• Area of Triangle = ½ (Base x height)
• Area of an equivalent Triangle =

Triangles as Parts of Rectangles:

• The sum or addition of 2 triangle areas is equivalent to the area of the rectangle.
• The area of both triangles is always the same or equal.

Area of a Parallelogram

• Either of the side of a parallelogram is the base of the parallelogram
• Height or altitude in a parallelogram is the perpendicular line which is drawn on that side from the opposite side of the vertex
• Area of a Parallelogram = Height x Base

Circumference of a Circle

• The distance of the circle is the circumference of the circular shape or location
• Ratio of Circumference of circle = Diameter of a circle. It is denoted as π (pi)

Circumference of a circle in terms of diameter:

• Circumference of a circle (C) = πd

Circumference of a circle in terms of radius:

• Circumference of a circle (C) = π d

Area of Circle:

Area of a Circle = pi r squared

### 1. What is meant by area?

The area of a planar figure or shape is measured as the volume of the space it encloses. Square centimetres or metres are used to calculate the area of the closed figure.

### 2. What is meant by perimeter?

A closed path that covers, encircles, or outlines a one-dimensional length or a two-dimensional shape is called a perimeter.

### 3. What weightage does Mathematics chapter 11 class 7 hold?

The chapter holds significant weightage from an examination point of view. Generally, short answer questions are asked from it.

### 4. How to access the class 7 Mathematics chapter 11 notes?

You can access the notes by visiting the Extramarks official website. All important concepts along with questions are described in a detailed manner.

### 5. What book is recommended for understanding the basics of chapter 11 class 7 Mathematics?

If you want to make your basics strong from the very beginning then start with NCERT books and then follow up with the questions given in the back exercise of the chapter.