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Currently I'm reading (for outside class) TL Heath's translation of Euclid's Elements of Geometry. I never thought I would hear such succinct "definitions" for lines and planes:

• A straight line between two points is the same distance as the distance between the points.
• A plane is a surface for which any line segment drawn between two points on the surface, falls fully in the surface.

Yeah, yeah, so they really are undefined, but these come really close. ^_^

Thanks for reading.

Song in my head: Trina Belamide, "Tell the World of His Love".