Point::angle PHP Méthode

    static function angle($pointA, $pointB, $pointC)
    {
        if (!isset(self::$angleTable[$pointA->guid . ';' . $pointB->guid . ';' . $pointC->guid])) {
            $AB = Point::distance($pointA, $pointB);
            $BC = Point::distance($pointB, $pointC);
            $AC = Point::distance($pointC, $pointA);
            // Al-Khashi theorem
            self::$angleTable[$pointA->guid . ';' . $pointB->guid . ';' . $pointC->guid] = rad2deg(acos((pow($AB, 2) + pow($BC, 2) - pow($AC, 2)) / (2 * $AB * $BC)));
        }
        return self::$angleTable[$pointA->guid . ';' . $pointB->guid . ';' . $pointC->guid];
    }