Assignment #97 and Area Calculator

Code

//Name: Mark Katz
    ///Period: 6
    ///Program Name: Area Calculator
    ///File Name: area.java
    ///Date Finished: 1/5/16 
import java.util.Scanner;

public class area
{
	public static void main( String[] args )
	{
		Scanner keyboard = new Scanner(System.in);
        
        System.out.println( "1) Traingle ");
        System.out.println( "2) Rectangle " );
        System.out.println( "3) Square " );
        System.out.println( "4) Circle " );
        System.out.println( "5) Quit ");
        
        
        System.out.print( "Which shape: ");
        int shape = keyboard.nextInt();
        System.out.print( "" );
        
        while ( shape != 5 )
        {
            //triangle
            if ( shape == 1 )
            {
                System.out.print( "Base: " );
                int base = keyboard.nextInt();
                System.out.print( "Height: ");
                int height = keyboard.nextInt();
                System.out.println("");
                System.out.println("The area is " + areaTriangle(base, height));
                System.out.println("");
            }
            //rectangle
            else if ( shape == 2 )
            {
                System.out.println( "Length: " );
                int length = keyboard.nextInt();
                System.out.println( "Width: " );
                int width = keyboard.nextInt();
                System.out.println("");
                System.out.println("The area is " + areaRectangle(length, width));
                System.out.println("");
            }
            //square
            else if ( shape == 3 )
            {
                System.out.println( "Side length: ");
                int side = keyboard.nextInt();
                System.out.println("");
                System.out.println("The area is " + areaSquare(side));
                System.out.println("");
                                   
                                      
            }
            //circle
            else if ( shape == 4)
            {
                System.out.println( "Radius: " );
                int radius = keyboard.nextInt();
                System.out.println("");
                System.out.println("The area is " + areaCircle(radius));
                System.out.println("");
            }
            
            else 
                System.out.println( "ERROR" );
                
                System.out.println( "1) Traingle ");
                System.out.println( "2) Rectangle " );
                System.out.println( "3) Square " );
                System.out.println( "4) Circle " );
                System.out.println( "5) Quit ");
                System.out.println( "Which shape?");
            
                                

        }
        System.out.println( "Goodbye");
    }
                                   
                                   
            public static double areaTriangle( int base, int height)
            {
                double result;
                result = (base * height) / 2 ;
                return result;
            }
            public static int areaRectangle( int length, int width )
            {
                int result;
                result= length * width;
                return result;
            }
            public static int areaSquare( int side )
            {
                int result;
                result= side * side;
                return result;
            }
            public static double areaCircle( int radius ) 
            {
                double result;
                result= 3.14159265359 * ( radius * radius );
                return result;
            }
        }
  
    

Picture of the output