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16 Cards in this Set
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 Back
parallel lines

2 lines that are parallel if they're coplanar and don't intersect


skew lines

2 lines are skew if they aren't coplanar and don't intersect


transversal

line that intersects 2 or more coplanar lines @different pts


corresponding angles

if they occupy corresponding postitions


alternate exterior angles

if they lie outside 2 lines on opposite sides of the transversal


alternate interior angles

if they lie b/n the 2 lines on opposite sides of the transversal


consecutive interior lines(same side interior angles)

if they lie b/n 2 lines on the same side of the transversal


Postulate 13: parallel postulate

if there is a line and a pt not one the line, then there is exactly one line thru the pt parallel to the given line


postulate 14: perpendicular postulate

if there is a line and a pt not on the line,then there is exactly one line thru the pt perpendicular to the given line


theorem 3.1

if 2 lines intersect to form a linear pair of congruent angles, then the lines are perpendicular


theorem 3.2

if 2 lines are perpendicular, then they intersect to form 4 right angles


postulate 15: corresponding angles postulate

if the lines r parallel then they'r congruent


thrm alternate interior angles

2 lines r alternate interior angles iff the pairs of a.i.a r congruent.


thrm 3.5 consecutive interior angles

if 2 parallel lines r cut by a transversal, then the pairs of c.i.a. are supplementary


thrm alternate exterior angles

if 2 parallel lines r cut by a transversal, then they'r congruent


thrm perpendicular transversal

if a transversal is perpendicular to 1 of 2 parallel lines, then it's perpendicular to the other
