A square is defined as a two-dimensional figure that is which is surrounded by four lines. It comes under the category of quadrilaterals which have four sides. A square is bounded by four equal sides that are joined together at right angles. An image showing square is given below:

Squares are of great importance in geometry. They are everywhere in real life. A chess board and a carom board are square, a photo frame may be square, a cushion may be square in shape etc.

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Square possesses properties as mentioned below:

- A square has 4 sides, 4 vertices and 2 diagonals.
- All four sides of a square are equal.
- Opposite sides of a square are parallel.
- All four interior angles are $90^{\circ}$.
- The diagonals of a square are equal in length.
- Both diagonals bisect each other at right angles.
- A square is a type of rhombus where all angles are $90^{\circ}$.

Diagonal of a square can be derived using Pythagorean theorem:

If the side of square is denoted by "a", then diagonal

$d^{2} = a^{2} + a^{2}$

$d^{2} = 2 a^{2}$

Perimeter of a square is the sum of all four sides. Since all the sides have same measure (say "a"), hence perimeter is given by:

Formula for the area of a square of side "a" is:

Given that:

$a = 8m$

Area of square = $a^2 = 8 \times 8 = 64 m^2$

Perimeter of the square = $8 \times 8 = 64 m$

Therefore, perimeter of a square = $4 \times length \ of \ a \ side$

= $(4 \times 6.5) cm$

= $26 cm$

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