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skew lines
non-coplanar lines that do not intersect
transversal
a line that intersects two or more coplanar lines at different points
perpendicular transversal theorem
in a plane, if a line is perpendicular to one of two parallel lines, then it is perpendicular to the other
Perpendicular Transversal Converse
if two lines in a plane are perpendicular to the same line, then the lines are parallel
parallel postulate
through a point not on a line, there is one and only one line parallel to the given line
exterior angle of a polygon
is an angle formed by a side and the extension of an adjacent side
remote interior angles
Each exterior angle has two non-adjacent remote interior
Triangle Exterior Angle Theorem
the sum of the two remote interior angles is equal to the exterior angles