LearnNext Lesson Video

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 × ½
   Squares filled more than half       0        0
  Squares filled less than half       0        0

Area covered by full squares = 6 × 1 = 6 sq units

Area covered by half squares = 7 × 1 2 7 2 = 3 1 2 sq units

Total area of the given shape = 6 + 3 1 2 sq units

Thus, the total area of the given shape = 9 1 2 sq units.

Area of a rectangle

Area of a rectangle =  length × breadth.

Area of the square

Area of the square = side × side.


1 . How to find the breadth If the length and perimeter Is given


    Let?s consider an example:
If length of a rectangle is 10 cm and its perimeter is 22 cm, then fin...

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3 . A room is 7m long and 4m 25cm wide.

Length of the room = 7 m
Breadth of the room = 4 m 25 cm = 4.25 m
Area of the floor of the room = length x breadth

4 . what is mensuration


5 . Five square pieces each of side 3 cm are cut from a rectangular board