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Now we know how to assign the value to a variable. Let's see how to use variables in the code and how variables are useful. Let's calculate the area of a rectangle with height as 50 and width 40. The formula for the area of a rectangle is -

```
Area of rectangle = height * width
```

Let's write the code. Define two variables `height`

and `width`

and give them the value of `50`

and `40`

respectively and then apply the formula

```
height = 50
width = 40
area_of_rectangle= height * width
print(area_of_rectangle)
```

Run the above code in the Jupyter notebook on the right-hand side. It should give print area as `2000`

- Modify the value of
`height`

variable to`60`

- Modify the value of
`width`

variable to`40`

- Calculate the area of rectangle with updated height and width and store it in the
`new_area_of_rectangle`

variable - Print the new area. It should print the area as
`2400`

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