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How can we imagine 'straight lines' on a sphere? Any 'line' drawn on the surface of the sphere appears to be 'curved'. We must come up with some definition of 'straight-line' that allows 'curving'.

This is actually simpler than it sounds. Let's declare the shortest path between two points on the surface of a sphere to be the 'straight' segment connecting them. Admittedly it does not *appear *straight.

**Note that **we do not go inside the sphere. We want to stay on it's *skin*.

In the following video, we discuss more on this notion of 'straight-line'.

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