4th Class Mathematics Perimeter and Area Perimeter and Area

Perimeter and Area

Category : 4th Class

Perimeter and Area




Closed Curve:


  • A curve which begins and ends at the same point is called a closed curve.




  • The length of the boundary or edge of a figure is called its perimeter.
  • Perimeter of a triangle is the sum of the lengths of its three sides.


Perimeter of triangle

  • The perimeter of a square is four times the length of its side.

Perimeter \[=(\text{4}\times \text{S})\] units

  1. The perimeter of a rectangle is twice the sum of its length and breadth.

Perimeter = 2x (Z + b) units

  1. Perimeter is expressed in units of length.



  • The amount of surface covered by a plane figure is its area.
  • Area of an enclosed plane is the number of square units that fit into it.
  • Area is always expressed in square units.


Other Topics

Notes - Perimeter & Area
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