r = $sugar;
		}
		public function kerulet() {
			$kerulet = 2 * $this->r * pi();
			return $kerulet;
		}
		public function terulet() {
			return pow( $this->r, 2) * pi();
		}
	}
	
	if ( isset( $_POST['send'] ) ) {
		$kor = new Circle( $_POST['r'] );
		echo 'A kerület: ' . $kor->kerulet();
		echo 'A terület: ' . $kor->terulet();
		
	}
?>