Program to convert Degree to Radian

Given the angle in degree, the task is to convert this into radians.
Examples:

Input: degree = 45 
Output: radian = 0.785398
Input: degree = 58
Output: radian = 1.01229
 

Approach:
Radian: The Radian is the SI unit for measuring angles, used mainly in trigonometry. A radian is defined by an arc of a circle. A full circle is just over 6 radians (Roughly 6.28). One radian is just under 57.3 degrees.
Degree: A degree, usually denoted by ° (the degree symbol), is a measurement of a plane angle, defined so that a full rotation is 360 degrees. Because a full rotation equals 2*pi radians, one degree is equivalent to pi/180 radians. 
The formula to convert radian to degree is:  

radian = degree * (pi/180) 
where pi = 22/7

Below is the implementation of the above approach: 

C++

// C++ program to convert degree to radian

#include <iostream>
#include <math.h>
using namespace std;

// Function for conversion
double Convert(double degree)
{
    double pi = 3.14159265359;
    return (degree * (pi / 180));
}

// Driver code
int main()
{
    double degree = 30;
    double radian = Convert(degree);
    cout << radian;
    return 0;
}

Java

// Java program to convert degree to radian
import java.io.*;
import java.util.*;

class GFG {

// Function for conversion
static double Convert(double degree)
{
    double pi = 3.14159265359;

    return (degree * (pi / 180));
}

// Driver code
public static void main(String[] args)
{
    double degree = 30;
    double radian = Convert(degree);

    System.out.printf("%.6f", radian);
}
}

// This code is contributed by coder001

Python3

# Python3 program to convert degree to radian

# Function for conversion
def Convert(degree):

    pi = 3.14159265359;
    return (degree * (pi / 180));

# Driver code
degree = 30;
radian = Convert(degree);
print(radian);

# This code is contributed by Code_Mech

C#

// C# program to convert degree to radian
using System;

class GFG{

// Function for conversion
static double Convert(double degree)
{
    double pi = 3.14159265359;

    return (degree * (pi / 180));
}

// Driver code
public static void Main()
{
    double degree = 30;
    double radian = Convert(degree);

    Console.Write("{0:F6}", radian);
}
}

// This code is contributed by Code_Mech

Javascript

<script>

// Javascript program to convert degree to radian

// Function for conversion
function Convert(degree)
{
    let pi = 3.14159265359;
    return (degree * (pi / 180));
}

// Driver code

    let degree = 30;
    let radian = Convert(degree);
    document.write(radian);


// This code is contributed Mayank Tyagi

</script>

Output

0.523599

Time Complexity: O(1), as we are not using any loops.
Auxiliary Space: O(1), as we are not using any extra space.

Approach 2: Use the math module

The math module in Python provides a function called radians(), which takes an angle in degrees and returns the corresponding 
angle in radians.

Code implementation for the above approach:

C++

#include <iostream>
#include <cmath>

int main()
{
    int degree = 45;
    double radian = M_PI * degree / 180.0;
    std::cout << radian << std::endl;
    return 0;
}

Java

public class Main {
    public static void main(String[] args) {
        int degree = 45;
        double radian = Math.PI * degree / 180.0;
        System.out.println(radian);
    }
}

Python

# code
import math
degree = 45
radian = math.radians(degree)
print(radian)

C#

// C# Code
using System;

class Program
{
    static void Main(string[] args)
    {
        int degree = 45;
        double radian = Math.PI * degree / 180.0;
        Console.WriteLine(radian);
    }
}

Javascript

const degree = 45;
const radian = degree * (Math.PI / 180);
console.log(radian);

Output:

0.785398

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