diff --git a/index.php b/index.php
new file mode 100644
index 0000000..01d2a37
--- /dev/null
+++ b/index.php
@@ -0,0 +1,63 @@
+<?php
+abstract class Figure{
+    abstract public function getArea();
+    abstract public function getPerimeter();
+}
+
+class Square extends Figure{
+    private $side;
+    public function __construct($side) {
+        $this->side = $side;
+    }
+    public function getArea(){
+        return $this->side ** 2;
+    }
+    public function getPerimeter(){
+        return $this->side * 4;
+    }
+  
+}
+class Rectangle extends Figure{
+    private $width;
+    private $height;
+    public function __construct($width,$height) {
+        $this->width = $width;
+        $this->height = $height;
+    }
+    public function getArea(){
+        return $this->width * $this->height;
+    }
+    public function getPerimeter(){
+        return $this->width * 2 + $this->height * 2;
+    }
+}
+class Circle extends Figure{
+    private $radius;
+    public function __construct($radius) {
+        $this->radius = $radius;
+    }
+    public function getArea(){
+        return round(pi() * ($this->radius ** 2),2);
+    }
+    public function getPerimeter(){
+        return round(2 * pi() * $this->radius,2);
+    }
+}
+class Triangle extends Figure{
+    private $base;
+    private $side1;
+    private $side2;
+    private $height;
+    public function __construct($base,$side1,$side2,$height) {
+        $this->base = $base;
+        $this->side1 = $side1;
+        $this->side2 = $side2;
+        $this->height = $height;
+    }
+    public function getArea(){
+        return ($this->base * $this->height) / 2;
+    }
+    public function getPerimeter(){
+        return $this->side1 + $this->side2 + $this->base;
+    }
+}
\ No newline at end of file