Perimeter and Area Class 7 Notes: Chapter 11

Perimeter and area class 7 notes provided here covers all the important concepts, formulas, and terms included in this chapter along with solved examples and practice questions. The topics that are covered in these CBSE class 7 notes for chapter 11 include-

  • What is Perimeter and Area of a Closed Figure?
  • Area and Perimeter of Some Common Figures
  • Conversion of Units
  • Examples
  • Practice Questions
  • Area and Perimeter Related Articles

What is Perimeter and Area of a Closed Figure?

The definition of area and perimeter of closed figures is explained below. Also, the area and perimeter formula of some of the common figures are given below.

Perimeter of a closed figure: Perimeter can be defined as the length of the boundary of a a figure i.e. the total distance around the figure.

Area of a closed figure: Area of any closed figure is defined as the space enclosed within it. In simple words, area is the part of plane that a closed figure occupies.

Note: It should be noted that the perimeter of a circle is called its circumference which is defined as the distance around a circle’s circular region.

Area and Perimeter of Some Common Figures

Shape Name

Area

Perimeter

Square

side × side

4 × side

Rectangle

length × breadth

2 × (length + breadth)

Parallelogram

base × height

2 × (side 1 + side 2)

Triangle

½ × base × height

side 1 + side 2 + side 3

Circle

pi × (radius)2

pi × diameter

Conversion of Units

An unit can be easily converted to other units. This can be understood better with the following example in which 1cm2 is converted to 1mm2.

1 cm = 100 mm

Now,

1 cm2 = 100 mm2.

A few important conversions:

  1. 1 cm2 = 1 mm2
  2. 1 m2 = 10000 cm2
  3. 1 hectare = 10000 m2

Example Questions

Example 1:

Perimeter and Area Class 7 Notes: Chapter 11

Example 2:

Perimeter and Area Class 7 Notes: Chapter 11

Example 3:

Perimeter and Area Class 7 Notes: Chapter 11

Practice Questions

  1. Calculate the circumference of a circle (in cm) whose radius is 28 mm.
  2. A circle of radius 3 cm is cut from a circular sheet of radius 4 cm. Calculate the area
    of the remaining sheet.
  3. The minute hand of a circular clock is 15 cm long. Calculate the distance the tip of the minute hand move in 1 hour.

Related Articles

To get more such maths and science notes of class 7, keep visiting BYJU’S. Also, get several topic-wise notes for class 7 along with several sample papers, questions papers and study materials to prepare for the exams more effectively.

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