## Pre-Requisires

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**Perimeter **is the length of the boundary of the geometric shape.

In other words the distance covered along theboundary forming aclosed figure whenyou go round the figure once.

**(a) **Perimeter of arectangle = 2 × (length + breadth) **(b) **Perimeter of a square = 4 × length ofits side. **(Scroll down to continue …)**

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**Mensuration**

**Perimeter **is the length of the boundary of the geometric shape.

In other words the distance covered along theboundary forming aclosed figure whenyou go round the figure once.

**(a) **Perimeter of arectangle = 2 × (length + breadth)

**(b) **Perimeter of a square = 4 × length ofits side

**(c) **Perimeter of anequilateral triangle =3 × length of a side

**(d) **Perimeter of a regular pentagon has five equal sides = 5 × length of a sides Figures in which all sides and angles are equal are called **regular closed figures**.

The amount of surface enclosed by a closed figure is called its area. To calculate the area of a figure using a squared paper, the following conventions are adopted :

**(a) **Ignore portions ofthe area thatare less thanhalf a square.

**(b) **If more than half a square is in a region. Count it as one square

**(c) **If exactly half the square is counted, take its area as

Area of a rectangle = length × breadth Area of a square = side × side

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