# Geometry Posts, Definitions, Theorems (2-5 to 3-3)

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1. If two lines are perpendicular,
then they form congruent, adjacent angles
2. If two lines form congruent, adjacent angles,
then the lines are perpendicular
3. If the exterior of two acute, adjacent angles are perpendicular,
then the angles are complementary
4. If two angles are supplements of congruent angles (or of the same angle),
then the two angles are congruent
5. If two angles are complements of congruent angles (or of the same angle),
then the two angles are congruent
6. Parallel Lines
coplanar lines that do not intersect
7. Skew Lines
noncoplanar lines that are neither intersecting nor parallel
8. Parallel Planes
planes that do not intersect
9. A line and a plane are parallel...
if they do not intersect
10. If two parallel planes are cut by a third plane,
then the lines of intersection are parallel
11. Transversal
a line that intersects two or more coplanar lines in different points
12. Alternate-Interior Angles
two non-adjacent interior angles on opposite sides of the transversal (always congruent)
13. Same-Side Interior Angles
two interior angles on opposite sides of the transversal (always supplementary)
14. Corresponding Angles
two angles in corresponding positions relative to the two lines (always congruent)
15. If two parallel lines are cut by a transversal,
then corresponding angles are congruent
16. If two parallel lines are cut by a transversal,
then alternate-interior angles are congruent
17. If two parallel lines are cut by a transversal,
then same side interior angles are supplementary
18. If a transversal is perpendicular to one of two parallel lines,
then it is perpendicular to the other one also
19. If two lines are cut by a transversal and alternate interior angles are congruent,
then the lines are parallel
20. If two lines are cut by a transversal and same-side interior angles are supplementary,
then the lines are parallel
21. In a plane, two lines perpendicular to the same line...
are parallel
22. Through a point outside a line
there is exactly one line parallel to the given line
23. Through a point outside a line,
there is exactly one line perpendicular to the given line
24. Two lines parallel to a third line
are parallel to each other

### Card Set Information

 Author: Anonymous ID: 241773 Filename: Geometry Posts, Definitions, Theorems (2-5 to 3-3) Updated: 2013-10-21 01:21:07 Tags: Geometry Folders: Description: Postulates, Definitions, and Theorems for 2-5 to 3-3 Show Answers:

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