src/Malenki/Math/Unit/Angle.php
public function rad()
    {
        if ($this->original->type == self::TYPE_RAD) {
            return $this->original->value;
        }

        return $this->float_rad;
    }
public function rad()
    {
        if ($this->original->type == self::TYPE_RAD) {
            return $this->original->value;
        }

        return $this->float_rad;
    }
gets angles as radians

@access public
@return float