Java Program to Find Angle of Intersection of Two Circles Having Their Centers D Distance Apart

import java.io.*;
class Main
{
    public static void main(String [] args)
    {
        double R1 = 3;
        double R2 =  4; 
        double D =  5;    
        // formula to find angle of intersection
        double a = (R1*R1 +R2*R2-D*D)/(2*R1*R2);
        System.out.println("The angle of intersection of 2 circle is " + a + " rad");
    }
}

Output:

The angle of intersection of 2 circle is 0.0 rad