#### Program

from math import pi
def myfun():
r = float(input("Input the radius of the circle : "))
# Calculate the area of the circle using the formula: area = π * r^2
area = pi * r ** 2
print("The area of the circle with radius " + str(r) + " is: " + str(area))
if __name__=="__main__":
myfun()

#### Output:

Input the radius of the circle : 1

The area of the circle with radius 1.0 is: 3.141592653589793

Input the radius of the circle : 4

The area of the circle with radius 4.0 is: 50.26548245743669

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