A wildlife researcher is tracking a flock of geese. The geese

fly 4.0 km due west, then turn toward the north by 40° and fly
another 4.0 km. How far west are they of their initial position?
What is the magnitude of their displacement?

1 answer

Starting at (0,0), their final location is
-4 + 4cis140° = -7.06 + 2.57i
see what you can do with that
come back if you get stuck