A spelunker is surveying a cave. He follows a passage that goes 210m straight west, then 180 m in a direction 45 degrees east of north, then 110m at 60 degrees east of south. After a 4th unmeasured displacement he finds himself back where he started. Use a scaled drawing to determine the 4th displacement.
The Attempt at a Solution
I drew the figure but still do not get it!! There are 4 different lines so it can't be a triangle. I am certain I have placed both degrees right.