Python Program to Find Area of a Circle

The area of a circle can simply be evaluated using the following formula.

Area = pi * r2
where r is radius of circle 

Python Program to Find Area of a Circle

Python3

# Python program to find Area of a circle

def findArea(r):
    PI = 3.142
    return PI * (r*r);

# Driver method
print("Area is %.6f" % findArea(5));

Output

Area is 78.550000

Time Complexity: O(1) since no loop is used the algorithm takes up constant time to perform the operations
Auxiliary Space: O(1) since no extra array is used so the space taken by the algorithm is constant

Python Program to Find Area of a Circle With Math library

Python3

# Python program to find Area of a circle
# using inbuild library

import math
def area(r):
  area = math.pi* pow(r,2)
  return print('Area of circle is:' ,area)
area(4)

Output

Area of circle is: 50.26548245743669

Time Complexity: O(1)
Auxiliary Space: O(1)

Please refer complete article on Program to find area of a circle for more details!