Final answer:
True. If two cities are located at the same latitude of 20° north, the shortest path between them is along the 20° parallel.
Step-by-step explanation:
The statement is True. If two cities are located at the same latitude of 20° north, the shortest path between them is along the 20° parallel. Lines of latitude are circles of different size on the Earth, and the longest line of latitude is the equator, which has a latitude of 0°. As you move away from the equator towards the North or South Pole, the circles of latitude shrink until they reach a point at latitudes of 90° north or south.