diff --git a/src/net/hypki/testjava/figures/Figure.java b/src/net/hypki/testjava/figures/Figure.java
index e945eee..0a6da9a 100644
--- a/src/net/hypki/testjava/figures/Figure.java
+++ b/src/net/hypki/testjava/figures/Figure.java
@@ -1,13 +1,11 @@
 package net.hypki.testjava.figures;
 
-public abstract class Figure {
+public abstract class Figure implements Area {
 	
 	private int id = -1;
 	
 	private String name;
-	
-	public abstract double computeArea();
-	
+		
 	public Figure() {
 		setName("Figure");
 	}
diff --git a/src/net/hypki/testjava/main/Main.java b/src/net/hypki/testjava/main/Main.java
index 8e55ed1..788de97 100644
--- a/src/net/hypki/testjava/main/Main.java
+++ b/src/net/hypki/testjava/main/Main.java
@@ -30,11 +30,15 @@ public class Main {
 		Triangle t = new Triangle(1, 2);
 		System.out.println(t.getColor());
 		
-		Area a = new Triangle(4, 10);
+		Area a  = new Triangle(4, 10);
+		a 		= new Rectangle(4, 10);
+		a 		= new Circle(10.0);
 		System.out.println(a);
 		
-		
-		System.out.println(((Triangle) a).getColor());
+		if (a instanceof Triangle)
+			System.out.println(((Triangle) a).getColor());
+		else if (a instanceof Circle)
+			System.out.println(((Circle) a).getRadius());
 	}
 
 }