*4.6 (Random points on a circle) Write a program that generates three random points
on a circle centered at (0, 0) with radius 40 and display three angles in a triangle
formed by these three points, as shown in Figure 4.7a. (Hint: Generate a random
angle a in radians between 0 and 2p, as shown in Figure 4.7b and the point determined
by this angle is (r*cos(a), r*sin(a)).)
public class Exercise04_06 { public static void main(String args[]) { double r = 40; System.out.println("Three random points are "); double angle = Math.random() * 360; double x = r * Math.cos(angle * Math.PI / 180); double y = r * Math.sin(angle * Math.PI / 180); System.out.println("(" + x + ", " + y + ")"); angle = Math.random() * 360; x = r * Math.cos(angle * Math.PI / 180); y = r * Math.sin(angle * Math.PI / 180); System.out.println("(" + x + ", " + y + ")"); angle = Math.random() * 360; x = r * Math.cos(angle * Math.PI / 180); y = r * Math.sin(angle * Math.PI / 180); System.out.println("(" + x + ", " + y + ")"); } }
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