17 terms

# Geom Ch3 vocab/terms

#### Terms in this set (...)

parallel lines
perpendicular lines
lines that intersect at 90 angles
skew lines
lines that are not coplanar, not parallel and do not intersect
parallel planes
transversal lines
a line that intersects two or more lines
corresponding angles
alternate interior
alternate exterior
same side interior
corresponding angles postulate
if 2 parallel lines are cut by a transversal, then the pairs of corresponding angles are congruent
alt. int. angles thm.
if 2 parallel lines are cut by a transversal, then the pairs of alternate interior angles are congruent
alt. ext. angles thm
if 2 parallel lines are cut by a transversal, then the pairs of alternate exterior are congruent
same-side interior angles thm
If 2 parallel lines are cut by a transversal, then the same side interior angles are supplementary.
converse of the alt. int. angles thm
if 2 complanar lines are cut by a transversal so that a pair of alternate interior angles are congruent then the two lines are parallel
converse of the alt. ext. angles thm
if two coplanar lines are cut by a transversal so that a pair of alt ext angles are congruent then the two lines are parallel
Converse of the Same-Side Interior Angles Theorem
If two coplanar lines are cut by a transversal so that a pair of alternate interior angles are supplementary, then the two lines are parallel.
perpindicular bisector
A line that is perpendicular to a segment at its midpoint.