Program to find area of a circle (original) (raw)

Last Updated : 27 Dec, 2024

Given the radius **r. Find the area of a circle. The area of the circle should be correct up to 5 decimal places.

**Examples:

**Input: r = 5
**Output: 78.53982
**Explanation: As area = PI * r * r = 3.14159265358979323846 * 5 * 5 = 78.53982, as we only keep 5 digits after decimal.

**Input: r = 2
**Output: 12.56637
**Explanation: As area = PI * r * r = 3.14159265358979323846 * 2 * 2 = 12.56637, as we only keep 5 digits after decimal.

Try It Yourself

The area of a circle can be calculated using the formula: **area = PI * r * r

C++ `

#include #include #include using namespace std;

float findArea(float r) { return (M_PI * r * r); }

int main() { float r = 5, area; area = findArea(r); cout << fixed << setprecision(5) << area; return 0; }

C

#include <stdio.h> #include <math.h> #define PI 3.14159265358979323846

float findArea(float r) { return (PI * r * r); }

int main() { float r = 5, area; area = findArea(r); printf("%.5f\n", area); return 0; }

Java

import java.lang.Math;

class GfG { static float findArea(float r) { return (float)(Math.PI * r * r); }

public static void main(String[] args) {
    float r = 5;
    float area = findArea(r);
    System.out.printf("%.5f%n",area);
}

}

Python

import math

def findArea(r): return math.pi * r * r

if name == "main": r = 5 area = findArea(r) print(f"{area:.5f}")

C#

using System;

class GfG { static float FindArea(float r) { return (float)(Math.PI * r * r); }

static void Main() {
    float r = 5;
    float area = FindArea(r);
    Console.WriteLine("{0:F5}",area);
}

}

JavaScript

function findArea(r) { return Math.PI * r * r; }

//Driver Code let r = 5; let area = findArea(r); console.log(area.toFixed(5));

`

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