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to calculate the area of a circle in Python, you can use the following code:

```python

import math

def calculate_area(radius):

    return math.pi * (radius ** 2)

# Taking user input

radius = float(input("Enter the radius of the circle: "))

# Calculate the area

area = calculate_area(radius)

# Print the result

print("The area of the circle is:", area)

```

In this program, we first import the `math` module which provides various mathematical operations. Then, we define a function `calculate_area` that takes the radius of a circle as a parameter and returns the calculated area using the formula `pi * radius^2`. 

Next, we ask the user to enter the radius of the circle. We convert the input to a float using `float(input())` so that we can handle decimal values as well.

After that, we call the `calculate_area` function passing in the entered radius value to calculate the area of the circle.

Finally, we print the result using `print()`, concatenating the calculated area using the `area` variable.

This program can be run and used to calculate the area of a circle by entering the radius value when prompted.