17 terms

Geom Ch3 vocab/terms

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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.