diff --git a/src/Circle.php b/src/Circle.php
new file mode 100644
index 0000000..6a86639
--- /dev/null
+++ b/src/Circle.php
@@ -0,0 +1,26 @@
+<?php
+
+  class Circle extends Shape {
+    
+    // class constants
+    const SHAPE_TYPE = 3;
+    
+    // property declarations
+    private $id;
+    protected $radius;
+
+    // method declarations
+    public function __construct( $radius ) {      
+      parent::__construct();
+      $this->radius = $radius;
+      $this->id = uniqid();
+    }
+    
+    public function area() {
+      return M_PI * $this->radius * $this->radius;
+    }
+          
+  } // end class
+
+?>
+
diff --git a/src/Rectangle.php b/src/Rectangle.php
new file mode 100644
index 0000000..1f47a23
--- /dev/null
+++ b/src/Rectangle.php
@@ -0,0 +1,11 @@
+<?php
+
+  class Rectangle extends Shape {
+    
+    // class constants
+    const SHAPE_TYPE = 2;    
+      
+  } // end class
+
+?>
+
diff --git a/src/Shape.php b/src/Shape.php
new file mode 100644
index 0000000..c3fe75b
--- /dev/null
+++ b/src/Shape.php
@@ -0,0 +1,62 @@
+<?php
+
+  class Shape {
+    
+    // class constants
+    const SHAPE_TYPE = 1;
+    
+    // property declarations
+    public $name;
+    protected $length;
+    protected $width;
+    private $id;
+     
+    // method declarations   
+    public function __construct ( $length = 0, $width = 0 ) {     
+      $this->length = $length;
+      $this->width = $width;      
+      $this->id = uniqid();
+    }
+    
+    public function getName() {
+      return $this->name;
+    }
+    
+    public function setName( $name ) {
+      $this->name = $name;
+    }
+    
+    public function getId() {
+      return $this->id;
+    }
+    
+    public function area() {
+      return $this->length * $this->width;
+    }
+    
+    static public function getTypeDescription() {
+      return "Type: " . static::SHAPE_TYPE;
+    }
+    
+    public function getFullDescription() {
+      switch (static::SHAPE_TYPE) {
+        case 1: // case of SHAPE
+            $shapeName = "Shape";
+            $postfix = "<#" . $this->id . ">: " . $this->name . " - " . $this->length . " x " . $this->width;
+            break;
+        case 2: // case of RECTANGLE
+            $shapeName = "Rectangle";
+            $postfix = "<#" . $this->id . ">: " . $this->name . " - " . $this->length . " x " . $this->width;            
+            break;
+        case 3: // case of CIRCLE
+            $shapeName = "Circle";
+            $postfix = "<#" . $this->id . ">: " . $this->name . " - " . $this->radius;
+            break;
+      } // end switch
+      
+      return $shapeName . $postfix;
+    }
+    
+  } // end class
+
+?>