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parallel lines
coplanar lines that don't intersect

skew lines
lines that don't intersect that are not coplanar

transversal
a line that intersects 2 or more lines in a plane at different points

Corresponding Angles Postulate
If 2 parallel lines are cut by a transversal, then each pair of corresponding angles is congruent

Perpendicular Transversal Theorem
In a plane, if a line is perpendicular to one of the 2 parallel lines, then it is perpendicular to the other.

rate of change
quantity changing over time

postulate
IF 2 lines in a plane are cut by a transversal so that corresponding angles are congruent, then the lines are parallel

Parallel Postulate
If a given line and a point not on the line, then there exists exactly one line through the point that is parallel to the given line.

