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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