a plane leaves an airport and travels 624km due east. It then turns toward the north and travels another 326 km. It then turns again less than 180 degrees and travels another 846 km directly back to the airport. Through what angles did it turn?

I get the east at 624 then north from there at 326. But what does it mean turns again less than 180 degrees and travels another 846?

Stuck on this, help if you can, thanks