1
Q
parallel lines
A
two lines are parallel if they are coplanar and do not intersect
2
Q
intersecting lines
A
intersecting lines are coplanar and have exactly one point in common
3
Q
oblique lines
A
lines are oblique if they intersect and do not form a right angle
4
Q
skew lines
A
two lines are skew if they do not lie in the same plane
5
Q
thm 3.1: transitive property of parallel lines
A
if 2 lines are parallel to the same line, then they are parallel to each other.
6
Q
thm 3.2: property of perpendicular lines
A
if two coplanar lines are perpendicular to the same line, then they are parallel to each other
Geometry
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