**Category : **4th Class

**Perimeter and Area**

**Synopsis**

**Closed Curve:**

** **

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

**Perimeter:**

- 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

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

Perimeter = 2x (Z + b) units

- Perimeter is expressed in units of length.

**Area:**

- 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.

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