class Polygon

import java.awt.*;

import java.util.*;

public class Polygon extends TwoDimFig {

protected Vector vertices;

Polygon() {}

Polygon(int n) {

vertices = new Vector();

int R = 100; double ANGLE = 2.0 * 3.14159 / n;

for(int i = 0; i < n; i++) {

Point p = new Point((int)(R + R*(Math.cos(i * ANGLE))),

(int)(R + R*(Math.sin(i * ANGLE))));

vertices.addElement(p);

}

public String describe() {

return "a polygon with " + vertices.size() + " vertices";

}