import java.applet.Applet;
import java.awt.*;
import java.lang.*;
import java.awt.event.*;
public class Kaks extends Applet implements MouseListener{
  int x, y, x1, y1, x2, y2, x3, y3, k1x, k1y, k2x, k2y, k3x, k3y;
  double k1, k2, k3, n1, n2, n3;
  public void init(){
    addMouseListener(this);
  }
  public void paint(Graphics g){
  g.setColor(Color.blue);
  g.fillRect(0, 0, getSize().width, getSize().height);	  
  }
  
  int i=1;
  

  public void mousePressed(MouseEvent e){
         
	
	if (i==1){
	x=e.getX();
    y=e.getY();
    Graphics g=getGraphics();      
    g.setColor(Color.red);
    g.fillOval(x-2, y-2, 4, 4);
	x1=x;
	y1=y;
	}   
	if (i==2){
	x=e.getX();
    y=e.getY();
    Graphics g=getGraphics();      
    g.setColor(Color.red);
    g.fillOval(x-2, y-2, 4, 4);
	x2=x;
	y2=y;
	}
	if (i==3){
	x=e.getX();
    y=e.getY();
    Graphics g=getGraphics();      
    g.setColor(Color.red);
    g.fillOval(x-2, y-2, 4, 4);
	x3=x;
	y3=y;
	g.setColor(Color.black);
	g.drawLine(x1, y1, x2, y2);
	g.drawLine(x2, y2, x3, y3);
	g.drawLine(x3, y3, x1, y1);
	
	k1=Math.round(Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)));
	k2=Math.round(Math.sqrt((x3-x2)*(x3-x2)+(y3-x2)*(y3-x2)));
	k3=Math.round(Math.sqrt((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3)));
	
	n1=Math.round( 57.1 *Math.acos( (k3*k3+k1*k1-k2*k2)/(2*k1*k3) ) );
	n2=Math.round( 57.1 *Math.acos( (k1*k1+k2*k2-k3*k3)/(2*k1*k2) ) );
	n3=Math.round( 57.1 *Math.acos( (k2*k2+k3*k3-k1*k1)/(2*k3*k2) ) );
	
	k1x=(x1+x2)/2;
	k1y=(y1+y2)/2;
	k2x=(x2+x3)/2;
	k2y=(y2+y3)/2;
	k3x=(x3+x1)/2;
	k3y=(y3+y1)/2;

	g.setColor(Color.white);
	g.drawString(""+n1, x1, y1);
	g.drawString(""+n2, x2, y2);
	g.drawString(""+n3, x3, y3);
	g.drawString(""+k1, k1x, k1y);
	g.drawString(""+k2, k2x, k2y);
	g.drawString(""+k3, k3x, k3y);
	
  } 	
	i++;
  }
  
  public void mouseReleased(MouseEvent e){}
  public void mouseExited(MouseEvent e){
    Graphics g=getGraphics();
    g.setColor(Color.blue);
    g.fillRect(0, 0, getSize().width, getSize().height);
  }
  public void mouseEntered(MouseEvent e){}
  public void mouseClicked(MouseEvent e){}
}