Program to find area of a circle

• Difficulty Level : Medium
• Last Updated : 05 Aug, 2022

Given the radius of a circle, find the area of that circle.

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

where r is radius of circle and it maybe in float because value of pie is 3.14

Approach: Using the given radius, find the area using the above formula: (pi * r * r) and print the result in float.

C++

 // C++ program to find area // of circle #include  const double pi = 3.14159265358979323846; using namespace std;   // function to calculate the area of circle float findArea(float r) {     return (pi * r * r); } // driver code int main() {     float r, Area;     r = 5;       // function calling     Area = findArea(r);     // displaying the area     cout << "Area of Circle is :" << Area;     return 0; }

C

 // C program to find area // of circle #include  #include  #define PI 3.142   double findArea(int r) {    return PI * pow(r, 2); }   int main() {     printf("Area is %f", findArea(5));     return 0; }

Java

 // Java program to find area // of circle       class Test {     static final double PI = Math.PI;                static double findArea(int r)     {        return PI * Math.pow(r, 2);     }                // Driver method     public static void main(String[] args)      {         System.out.println("Area is " +  findArea(5));     } }

Python3

 # Python3 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));   # This code is contributed by Chinmoy Lenka

C#

 // C# program to find area of circle using System;   class GFG {     static double PI = Math.PI;               static double findArea(int r)     {     return PI * Math.Pow(r, 2);     }               // Driver method     static void Main()      {         Console.Write("Area is " + findArea(5));     } }   // This code is contributed by Sam007.

PHP

 

Javascript

 

Output

Area of Circle is :78.5398

Time Complexity: O(1)
Auxiliary Space: O(1), since no extra space has been taken.

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