## Area of Square

To find the area of a square whose length of a side is given, use the following formula.

`Area of Rectangle = side * side`

## Program

In the following program, we shall define a function `areaOfSquare()`

that takes length of a side as argument and return the area of square.

We read length of a side as integer from user, call `areaOfSquare()`

with the length of side passed as argument. You can also read length of the side as floating-point number from user using float() function. In the following program we use int() and you may try float() as practice.

**Input**

length of a `side`

, where `side > 0`

**Python Program**

```
def areaOfSquare(side) :
if side < 0 :
print('Side cannot be negative.')
return
return side * side
side = int(input('Enter side length : '))
area = areaOfSquare(side)
print(f'Area of Square : {area}')
```

**Output**

```
Enter side length : 7
Area of Square : 49
```

**Important Points regarding above program**

- input() function reads a string from standard input. Therefore, we have used int() function to convert string to integer.
- If given length of side is less than zero, we are returning nothing.