III. Give reasons:
1. Equator is a great circle but the Tropic of
Cancer is a small circle.
2. Aircrafts follow great circle routes.
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The Equator is a great circle, but the Tropics of Cancer and Capricorn are not (they are smaller than the Equator). And the Arctic and Antarctic Circles are even smaller than the Tropics and definitely not great circles. On the left globe, all the lines running top to bottom (longitude) are great circles
The shortest distance between those cities – which is the route an airline wants its planes to fly – is a curve when represented on a map rather than a sphere. To travel the shortest distance between two points, aircraft follow that curve, known as a great circle route.
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