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Undefined terms

words, usually readily understood, that are not formally explained by means of more basic words and concepts.

Point

a location

Line

made up of points and has no thickness or width

Collinear

points on the same line

Plane

a flat surface made up of points

Coplanar

points that lie on the same plane

Space

a boundless, three-dimensional set of all points

Locus

a set of points that satisfy a particular condition

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