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The relationship between points and a line

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By a line, a great circle on the sphere is referenced. Is it still true that two points determine a unique line? Is it still true that two distinct lines either meet in a single point or do not meet at all? Explain.

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Solution Summary

The relationship between points and a line is reinforced.

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Is it still true that two points determine a unique line?
Answer: No
Let's consider the earth as the sphere. The north pole and the south pole are the two ...

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