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Angle subtended by the chord when the angle subtended by another chord of same length is given
  • Last Updated : 09 Mar, 2021

Given a circle having two chords of equal length. The angle subtended by one of the chords to the centre is given. The task here is to find the measure of the angle subtended by another chord at the centre.
Examples: 
 

Input: 48
Output: 48 degrees


Input: 82
Output: 82 degrees

 

Approach
Let AC & BD are the two equal chords of the circle having center at O.let the angle subtended by the chord AC be x degrees. 
now, 
in triangle AOC & BOD
AO = OB(radii of same circle) 
AB = CD(equal chords) 
OC = OD(radii of same circle) 
so, the triangles AOC & BOD are congruent to each other 
so, angle AOC = angle BOD 
 

Equal chords of a circle subtend equal angles at the centre.



Below is the implementation of the above approach: 
 

C++




// C++ program to find the angle
// subtended at the center by the chord
// when the angle subtended at center
// by another chord of equal length is given
 
#include <bits/stdc++.h>
using namespace std;
 
void angleequichord(int z)
{
    cout << "The angle subtended at the center is "
         << z << " degrees" << endl;
}
 
// Driver code
int main()
{
    int z = 48;
    angleequichord(z);
    return 0;
}

Java




// Java program to find the angle
// subtended at the center by the chord
// when the angle subtended at center
// by another chord of equal length is given
 
import java.io.*;
 
class GFG
{
     
static void angleequichord(int z)
{
    System.out.println ( "The angle subtended at the center is "+
        z + " degrees");
}
 
// Driver code
public static void main (String[] args)
{
 
    int z = 48;
    angleequichord(z);
}
}
 
// This code is contributed by ajit.

Python3




# Python3 program to find the angle
# subtended at the center by the chord
# when the angle subtended at center
# by another chord of equal length is given
 
def angleequichord(z) :
 
    print("The angle subtended at",
          "the center is", z ,"degrees" );
 
# Driver code
if __name__ == "__main__" :
     
    z = 48;
    angleequichord(z);
     
# This code is contributed by AnkitRai01

C#




// C# program to find the angle
// subtended at the center by the chord
// when the angle subtended at center
// by another chord of equal length is given
using System;
     
class GFG
{
     
static void angleequichord(int z)
{
    Console.WriteLine( "The angle subtended at the center is "+
        z + " degrees");
}
 
// Driver code
public static void Main (String[] args)
{
 
    int z = 48;
    angleequichord(z);
}
}
 
/* This code contributed by PrinciRaj1992 */

Javascript




<script>
// JavaScript program to find the angle
// subtended at the center by the chord
// when the angle subtended at center
// by another chord of equal length is given
  
 
function angleequichord(z)
{
    document.write("The angle subtended at the center is "
        + z + " degrees" + "<br>");
}
 
// Driver code
 
    let z = 48;
    angleequichord(z);
      
// This code is contributed by Surbhi Tyagi.
 
</script>
Output: 
The angle subtended at the center is 48 degrees

 

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