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**Finding the displacement....**

Okay so I've been having alot of trouble trying to find the final displacement for a person who begins walking 200 meters west, the 300 meters south and finally meets his friend 150 meters away. I somehow got that he will be 80.5 degrees South or West by going Tan*(300m/80m) but I can't get his displacement as 58.3 meters...I'm confused. Help will be greatly appreciated :)