point
identifies a location and has no size
line
straight set of points extending infinitely in each direction that has no width or thickness and contains infinitely many points
plane
infinite flat surface made up of points extending infinitely in both directions that has no thickness and contains infinitely many lines/points
Definition Characteristics
accurate, understandable, reversible, concise, and objective
Accurate
states the term being defined and clearly communicates the concept
understandable
the definition uses only words that have been previously defined or are clearly understood without being defined
reversible
the definition identifies the class to which the object belongs and its distinguishing characteristics
concise
definition avoids unnecessary wording while being grammatically correct
objective
the definition avoids using emotional words, figures of speech, and limitations of time and space
collinear points
points that lie on the same line
Noncollinear points
points that do not lie on the same line
concurrent lines
lines whose intersection is a single point
coplaner points
points that lie on the same plane
Coplaner lines
lines that lie on the same plane
parallel lines
coplanar lines that do not intersect
parallel planes
planes that do not intersect
skew lines
lines that are not coplanar