Topic: Python Find Area of Circle using User Defined Function

The area of a circle is given by the formula:

area = PI x R^{2}

where PI is the popular math constant = 3.14159 and R is the radius of the circle.

We will use the math module in this Python program. Import math module and use math.pi. To calculate R squared we will use the power operator ** with 2 as power.

We will use the Python expression for area of circle formula:

area= math.p * radius**2

# Python program to find # area of circle when # radius is given # with the help of user defined function import math def circle_area(radius): return math.pi * radius ** 2 def main(): radius = float(input("Enter value for base of triangle:")) area = circle_area(radius) area = round(area,4) print("The Area of circle is : ",area) main()

### Output Python Find Area of Ciircle

Enter value for base of triangle:7.3 The Area of circle is : 167.4155