Pythagorem theorem

hi
having a little problem with pythagorem theorem the problem is is that I've wrote the formula to find the length of the hypotenuse line but when I draw this to the screen the line is longer tha my right triangle help would be appreciated

package trigSystem;

import java.awt.*;
import javax.swing.*;

public class TrigGUI1 extends JFrame
{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public TrigGUI1()
	{
		// TODO Auto-generated constructor stub
		super();
		setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );	
			
		setSize( 500, 500 );
		setVisible( true );
	}
	
	public void rightTriangle( Graphics g )
	{
		g.drawLine( 250, 250, 400, 250 );
		g.drawLine( 400, 250, 400, 100 );
		
		g.setColor( Color.RED );
		g.drawLine( 250, 250, 250 + ( int )pythagoremTheorem(), 250 - ( int )pythagoremTheorem()  );
		
	}		
	public double pythagoremTheorem()
	{
		double adj = 150;
		double opp = 150;
		
		double hyp = opp * opp + adj * adj;
		double calc = Math.sqrt( hyp );
		//System.out.println( "Pythagorem length: " + calc );
		return calc;
	}
	
	public void paint( Graphics g )
	{
                super.paint( g );

		rightTriangle( g );
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) 
	{
		// TODO Auto-generated method stub
		new TrigGUI1();
	}

}

I do have an image but having trouble uploading it but will try