One afternoon, a couple walks two-thirds of the way around a circular lake, the radius of which is 1.60 km. They start at the west side of the lake and head due south to begin with. (a) What is the distance they travel? (b) What are the magnitude and direction (relative to due east) of the couple's displacement? i know that the distance is 6.702 km, but I dont know how to find the magnitude and the direction. I know that whatever the direction is, it is north of west. Can you help me figure out the magnitude and the direction? please!!