CBSE Class 6 Maths Revision Notes Chapter 10

CBSE Class 6 Mathematics Revision Notes Chapter 10 – Mensuration

Class 6 Mathematics Chapter 10 Notes focus on the concepts of mensuration of basic geometric figures. At Extramarks, subject matter experts prepare these notes to help students understand the fundamentals and quickly recall all the formulas given in the chapter. These notes are prepared as per the CBSE guidelines, so that students can access quality materials from a centralised  platform to access the required study material to boost their level of diligence and focus to get a 100% result in exams. 

Class 6 Mathematics Chapter 10 Notes are easily accessible on the Extramarks website. Students can study  at their convenience and boost their exam preparations.

Access Class 6 Mathematics Chapter 10 – Mensuration Notes

Class 6 Mathematics Chapter 10 Notes include the following topics: 

  • Perimeter
  • Perimeter of a rectangle
  • Perimeter of a square
  • Perimeter of an equilateral triangle
  • Perimeter of a regular pentagon
  • Regular closed figure
  • Area of a rectangle
  • Area of a square
  • Calculating area on a squared paper


  • Perimeter is the sum of the lengths of the sides of a closed geometric shape. If someone starts walking along the boundary of a geometrical figure from a particular point and comes back to it, the distance covered is called the perimeter of the shape.
  • Perimeter of a rectangle = 2 x (length + breadth)
  • Perimeter of a square = 4 x length of its one side
  • Perimeter of an equilateral triangle = 3 x length of one of its edges
  • Perimeter of a regular pentagon = 5 x length of one side

Regular Closed Figure

  • A geometric figure with sides of equal length and angles of equal measure is called a regular closed figure.

Area Of a Closed Figure

  • Area of a closed figure refers to the amount of the total surface area it encloses with its sides.
  • A closed figure can be a rectangle, a square, a triangle or any polygon.
  • The area of a rectangle = length x breadth
  • The area of a square = length of side x length of side = (length of a side)2
  • The area of a triangle = 12 breath height

Method of Calculating the Area of a Shape on a Squared Paper

  • Take a squared paper where every square measures 1 unit x 1 unit.
  • The area covered by every square is 1 sq. unit.
  • Place the shape on the paper and gently trace the outline.
  • Avoid the parts of the shape which are less than half a square.
  • Count it as one square if any region of the shape covers more than half a square.
  • Now, note the total number of squares and half squares.
  • Calculate their areas.
  • The sum of the areas of the squares and half squares will be the area of the given geometric figure.

FAQs (Frequently Asked Questions)

1. What is a perimeter?

In geometry, perimeter refers to the total length of the boundary of a given geometric shape.

2. What is an area?

The area of a geometric shape refers to the amount of total surface area covered by it.

3. How can the perimeter of an equilateral triangle be calculated?

The following formula can be used to calculate the perimeter of an equilateral triangle: 3 x the length of a side.

4. How is the area of a square calculated?

The formula to find the area of a square is: (length of a side)2.