diff --git a/w4/Circle.class b/w4/Circle.class
new file mode 100644
index 0000000..a57ddad
Binary files /dev/null and b/w4/Circle.class differ
diff --git a/w4/Circle.java b/w4/Circle.java
new file mode 100644
index 0000000..c87f39e
--- /dev/null
+++ b/w4/Circle.java
@@ -0,0 +1,20 @@
+public class Circle extends Shape {
+    private double radius;
+
+    public Circle(double radius) {
+        this.radius = radius;
+    }
+
+    public double getRadius() {
+        return radius;
+    }
+
+    public void setRadius(double radius) {
+        this.radius = radius;
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI * radius * radius;
+    }
+}
\ No newline at end of file
diff --git a/w4/Rectangle.class b/w4/Rectangle.class
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index 0000000..8601b1d
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diff --git a/w4/Rectangle.java b/w4/Rectangle.java
new file mode 100644
index 0000000..4d1d1bb
--- /dev/null
+++ b/w4/Rectangle.java
@@ -0,0 +1,30 @@
+public class Rectangle extends Shape {
+    private double width;
+    private double height;
+
+    public Rectangle(double width, double height) {
+        this.width = width;
+        this.height = height;
+    }
+
+    public double getWidth() {
+        return width;
+    }
+
+    public void setWidth(double width) {
+        this.width = width;
+    }
+
+    public double getHeight() {
+        return height;
+    }
+
+    public void setHeight(double height) {
+        this.height = height;
+    }
+
+    @Override
+    public double getArea() {
+        return width * height;
+    }
+}
\ No newline at end of file
diff --git a/w4/Shape.class b/w4/Shape.class
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index 0000000..54a12cc
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