1. An airplane takes off and flies 245 km on a course of 45.0° south of west and then changes direction and flies 175 km due south, where it lands. Find the displacement from its starting point to its landing point.

2. A ship travels 155 km from port on a course of 35.0° south of west to an island. It then travels 142 km on a course of 55.5° east of south to a second island. Then it travels 138 km on a course of 9.4° north of east to a third island. Then it travels 185 km due east to a fourth island. Find the displacement from its starting point to its ending point.