Chapter Notes - Mensuration Class 6 Notes | EduRev

Mathematics (Maths) Class 6

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Class 6 : Chapter Notes - Mensuration Class 6 Notes | EduRev

The document Chapter Notes - Mensuration Class 6 Notes | EduRev is a part of the Class 6 Course Mathematics (Maths) Class 6.
All you need of Class 6 at this link: Class 6

 Mensuration:Mensuration is a branch of mathematics which is a topic in Geometry. It  is a study of various geometrical shapes, their length, breadth, volume, and area for 2D as  well as 3D shapes. Some important terminologies included in this topic are covered below.


  Perimeter:

Chapter Notes - Mensuration Class 6 Notes | EduRev

Closed figure:A figure with no open ends is a closed figure.

Regular closed figures: A closed figure in which all the sides and angles equal.

Perimeter:

Perimeter is the distance covered along the boundary forming a closed figure when we go round the figure once. The concept of perimeter is widely used in real life.

Eg: 1) For fencing land.

2) For building a compound wall around a house.

The perimeter of a regular closed figure is equal to the sum of its sides.

Perimeter of a rectangle:

= Length(l) + Breadth(b) +Length(l) + Breadth (b)
= 2 (l + b)

Chapter Notes - Mensuration Class 6 Notes | EduRev

Perimeter of a square:

= s+s+s+s
Chapter Notes - Mensuration Class 6 Notes | EduRev

Chapter Notes - Mensuration Class 6 Notes | EduRev


Equilateral triangle:

A triangle with all its sides and angles equal is called an equilateral triangle.

The perimeter of an equilateral triangle with the side 'a'=a+a+a =3 x a

Chapter Notes - Mensuration Class 6 Notes | EduRev

Area:

Chapter Notes - Mensuration Class 6 Notes | EduRev

The amount of surface enclosed by a closed figure is called its area. The following conventions are to be adopted while calculating the area of a closed figure using a squared or graph paper.

1. Count the fully-filled squares covered by the closed figure as one square unit or unit square each.
2. Count the half-filled squares as half a square unit.
3. Count the squares that are more than half-filled as one square unit.
4. Ignore the squares filled less than half.

For example, the area of this shape can be calculated as shown:

Chapter Notes - Mensuration Class 6 Notes | EduRev

Covered area

Number

Area estimate (sq. units)

Fully filled squares

6

6

Half-filled squares

7

7 x 1/2

Squares filled more than half

0

0

Squares filled less than half

0

0

Area covered by full squares = 6 x 1 = 6 sq. units Area covered by half squares = 7 x ½ = 7/2= 3 ½ sq. units.

Total area of the given shape = 6 + 3 ½ sq. units Thus, the total area of the given shape = 9 ½ sq. Units.
Area of a rectangle can be obtained by multiplying length by breadth. Area of the square can be obtained by multiplying side by side.


Chapter Notes - Mensuration Class 6 Notes | EduRev

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