# Geometry Definitions

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1. How do you name a line?
single lower case letter OR two points contained on the line
2. How do you name a plane?
capital letter OR 3 noncollinear points
3. How do you name a segment?
the two endpoints
4. How do define a point, line and plane?
They are UNDEFINED.
5. Collinear Points
all points lie on the same line
6. Coplanar
all points lie on the same plane
7. Where does a point and a line intersect?
intersect at a point
8. Where do 2 lines intersect?
one point
9. Where does a line and a plane intersect?
it depends.

• poked through = one point
• whole line = infinite amount of points
10. Where do two planes intersect?
At a line
11. What is a space?
the set of all points
12. AB
a length
13. AB^___ (with line over top)
a segment
14. Congruent
same size and shape
15. Tick Marks
indicate congruency (shape but not size)
16. Midpoint
the midpoint of segment AB is the point between A & B where AM=MB
17. segment bisector
segment, line, or plane that intersects a segment at its midpoint
18. ray
one a line, 1 point (endpoint) and all points extending off in one direction
19. angle
figure formed by 2 non-collinear rays having same endpoint
20. congruent angles
<'s with the same measure
21. Angle bisector
divides an angle into 2 CONGRUENT angles
have a common side and vertex, No overlap or gap.
23. vertical angles
2 non-adjacent angles formed by intersecting lines
24. linear pair
• adjacent angles whose non-common sides form opposite rays.
• (sum of measures= 180)
25. complementary angles
2 angles whose sum is 90
26. supplementary angles
2 angles whose sum is 180
27. perpendicular lines (upside down T)
• intersect to form right angles
• (rays,segments or planes can be perpendicular)
28. inductive reasoning
using examples to make a conjecture
29. counterexample
example proving a conjecture false
30. statement
sentence which is either T or F (truth value)
31. negation
opposite of a statement (not...) (~p)
32. compound statement
join 2 statements
33. conjunction
joined with the word AND

T=both true
34. disjunction
joined with OR

T=at least one true
35. venn diagrams
conjuctions are intersections (overlap)

disjunctions are unions (whole thing)
36. If______, then_______
if hypothesis, then conclusion
37. converse
switches the hypothesis & conclusion in conditional
38. Inverse
negate both hypothesis and conclusion in conditional
39. Contrapositve
Negate and Switch hypothesis and conclusion

OR negate hypothesis and conclusion of the converse
40. deductive reasoning
using rules to make a conclusion
41. Law of Detachment
if conditional is true and hypothesis is true, then conclusion is true
42. Law of Syllogism
if p-> q and q->r are true, then p->r is true.
43. if mp definition, then....
=
44. if mp theorem, then...q
CONGRUENT
 Author: kristajrco8 ID: 37530 Card Set: Geometry Definitions Updated: 2010-10-29 04:05:59 Tags: definitions Folders: Description: definitions up to chapter 2 Show Answers: