Question

The routes along the Great Circle are the shortest
routes and are called the Great Circle Routes. (How)​

Answer 1

Answer:

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Or why is it that when you see flight paths on a map they always take a curved route between 2 cities? It's because planes travel along the shortest route in a 3-dimensional space. This route is called a geodesic or great circle route. They are common in navigation, sailing and aviation.