# Calculations with Variables

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`

INSTRUCTIONS
• 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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