Calculate the area of circle

Answer 1

1. Using math library import.math

2. Ask user to input circle radius

3. Now u can use area of circle formula

Area of Circle = π * R * R.

Answer 2

Firstly, you must know the formula :

Area of Circle = π×r² or π×r×r

*r means radius of the circle
* π (pi) = 3.1426

There are 2 ways to calculate the area of circle in python:

#No. 1:
print(3.1416*(float(input()))**2)

#No. 2 (Recommended):
from math import pi
print(pi*(float(input()))**2)

Answer 3

from math import *
def circle_area():
r=int(input("Enter radius of circle"))
area = pi*r**2
print (area)
circle_area()