# Area of a Square – Definition with Examples

## Definition

The number of square units needed to fill a square is its area. In common terms, the area is the inner region of a flat surface (2-D figure).

In the given square, the space shaded in violet is the area of the square.

For example, The space occupied by the swimming pool below can be found by finding the area of the pool.

## The Formula for the Area of A Square

The area of a square is equal to (side) ×  (side) square units.

The area of a square when the diagonal, d, is given is d2÷2 square units.

For example,

The area of a square with each side 8 feet long is 8 × 8 or 64 square feet (ft2).

## Solved Examples

Example 1: Given that each side is 5 cm, find the area of a square.

Solution:

Area of a square = side × side

Area = 5 × 5

Area = 25 cm2

Example 2: The side of a square wall is 50 m. What is the cost of painting it at the rate of Rs. 2 per sq. m?

Solution:

Side of the wall = 50 m

Area of the wall = side × side = 50 m × 50 m = 2500 sq. m

The cost of painting 1 sq. m = Rs. 2

Thus the cost of painting a 2500 sq. m wall = Rs. 2 × 2,500 = Rs 5,000

Example 3: Find the area of a square whose diagonal is measured is 4 cm.

Solution:

Given:

Side, d = 4 cm

We know that the formula to find the area of a square when the diagonal, d, is given is d2÷2 square units.

Substituting the diagonal value, we get:

= 42÷2 = 16 ÷ 2 = 8

Thus, the area of the square is 8 cm2.

## Practice Problems

### 1What is the area of a square table whose diagonal is 6 feet?

16 ft$^{2}$
18 ft$^{2}$
20 ft$^{2}$
22 ft$^{2}$
CorrectIncorrect
Correct answer is: 18 ft$^{2}$
The formula to calculate the area of the square when the diagonal is given is d2/2. Here, the length of the diagonal = 6 ft As per the formula, it can be written as:

Area of Square= 6$^{2}$/2
= 36/2
= 18

Thus, the area of the square table is 18 sq feet.

### 2Calculate the floor area of the square room, furnished by 250 square tiles of sides 30 inches.

180000 sq inches
180000 sq meters
220000 sq inches
240000 cubic inches
CorrectIncorrect
Correct answer is: 180000 sq inches
Total number of tiles = 250 Side of one tile = 30 inches Area of 1 tile = 30 x 30 inches
= 900 square inches

So, the area occupied by 200 tiles of sides 30 inches = Area of one tile x Total number of tiles

Total Floor Area = 900 x 200 square inches
= 180000 sq inches

### 3The area of the square garden is 784 m2. Find out the length of the garden?

24 meters
26 meters
28 meters
30 meters
CorrectIncorrect
Answer: Area of garden = 784 m$^{2}$
Side of the garden = ?
We know the formula to calculate the side of the square or garden, A = Side$^{2}$
It can be written as,
784 m$^{2}$ = Side$^{2}$
Therefore, side of the garden = $\sqrt{784}$
= 28 meters

### 4Find the area of the square swimming pool whose side is 18 m.

361 m$^{2}$
225 m$^{2}$
256 m$^{2}$
324 m$^{2}$
CorrectIncorrect
Correct answer is: 324 m$^{2}$
324 m$^{2}$
Side of the swimming pool, or a = 18m
Area of swimming pool = a$^{2}$
= 18 x 18
= 324 m$^{2}$