Consider the Euclidean plane, and instead of ordinary lines, let the line segments PQ for all pairs of distinct points P, Q be taken as the “lines.” Show that this system of points and lines satisfies Axioms 0–2. What seems unnatural to you about this geometry?

Elementary Geometry For College Students, 7e
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ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
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  1. Consider the Euclidean plane, and instead of ordinary lines, let the line segments PQ for all pairs of distinct points P, Q be taken as the “lines.” Show that this system of points and lines satisfies Axioms 0–2. What seems unnatural to you about this geometry?

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