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# Chapter Notes - Mensuration Class 6 Notes | EduRev

## Mathematics (Maths) Class 6

Created by: Praveen Kumar

## 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: 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:

= 2 (l + b) Perimeter of a square:

= s+s+s+s  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 Area: 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: 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. ,

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