Example: How to Find Area of a Circle with Diameter in Python using Functions

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# How to Find Area of a Circle with Diameter in Python using Functions
# To calculate the diameter
def Diameter(r):
    return 2 * r

# To calculate the circumference
def Circumference(r):
    return 2 * 3.14 * r

# To calculate the area
def Area(r):
    return 3.14 * (r * r)

# It's the driver code
print("Enter the radius of the circle::\n")

r = float(input()) # r = radius

# It will print the final output
print("Diameter       = ", Diameter(r), "units")
print("Circumference  = ", Circumference(r), "units")
print("Area           = ", Area(r), " sq. units")