One afternoon, a couple walks two-thirds of the way around a circular lake, the radius of which is 1.55 km. They start at the west side of the lake and head due south to begin with. (a) What is the distance they travel? 6.49 km (b) What are the magnitude and direction (relative to due east) of the couple's displacement? _____________ km _____________(degrees) north of east I got the answer for part (a) by finding the circumference of the lake and multiplying by (2/3). I'm having a hard time trying to find the displacement and the angle north of east.