# Geometry_semester_1.txt

The flashcards below were created by user ghstechnology on FreezingBlue Flashcards.

1. Collinear
Points on the same line
2. Coplaner
points on the same plane
3. Non collinear
points not on the same line
4. non coplaner
points not on the same plane
5. area of a Rectangle
Base x height
6. area of a triangle
Base x height / 2

b x h / 2
7. Area of a parallelagram
Base x Height
8. Area of a circle
A= Pi(r2)
9. Circumference of a circle
C= Pi (d)

D= diameter
10. diameter of a circle
D=2r

11. Complementary angle is equal to :
90 degrees
12. Supplementary angle is equal to :
180 degrees
13. Midpoint formula
M = (X1 + X2 / 2 , Y1+ Y2 / 2)

14. Endpoint formula
( X1+ X / 2 = X2 , Y1+ Y / 2 = Y2 )
15. Distance Formula
D = [ ( x1-x2 )2 + ( y1-y2 )2

[ = square root sign
16. Linear pair
Two angles that create a line
17. Theorem: All verticle angles are....
Congruent
18. Acute angle
Less than 90 degrees
19. Obtuse angle
More than 90 degrees
20. Straight angle
180 degrees
21. To bisect an angle is to
cut it in half
next to eachother. no overlapping
23. Conditional Statement
A -> B
24. Converse Statement
B -> A
25. Inverse Statement
Not A -> Not B
26. Contrapositive Statement
Not B -> Not A
27. Deductive Reasoning
Uses facts to come to a conclusion
28. Inductive Reasoning
Uses a pattern to determine a conclusion
29. counter Examples
• Prove the statement is false
• (ex. All polygons are squares. Prove wrong: Rectangles etc)
30. Biconditional statement
• If and only if
• (ex. If a polygon has three sides than it is a triangle. BICONDITIONAL: A polygon has three sides if and only if {iff} it is a triangle.
31. Perpendicular lines Form
A right angle
32. Law of detatchment
if hypothesis is true, then conclusion is true
33. Law of Syllagism
• EX. Conclude that A -> B
• A->N
• N->P
• P->B
34. segments are congruent if and only if:
The lengths are equal
35. If the lines are parallel then:
The corresponding angles are congruent
36. If two lines are parallel than:
The alternate interior angles are congruent
37. If two lines are parallel than:
the alternate exterior angles are congruent
38. If two lines are parallel then:
The consecutive interior angles are supplentary
39. Slope is
• Y = Mx + B
• M= slope
• B=y intercept
40. Scalene triangle
all different sides
41. Isosceles triangle
Two equal sides
42. Equalatrial triangle
All sides are equal
43. Equiangular
All angles are equal
44. Exterior angle theorum:
• M<1+M<2= M<3
• (measure of angle 1 + measure of angle 2 = measure of angle three)
45. 5 congruence thrms
• SAS: side angle side
• SSS: side side side
• HL: hypotenuse and leg
• ASA: angle side angle
• AAS: angle angle side
46. if two lines are parallel then their
slopes are the same
47. Slope formula
Y1-Y2 / X1-X2
48. Point slope formula
Y-Y1=M( X-X1 )
49. Translation
slide
50. reflection
flip
51. rotation
turn
52. CPCTC
Corresponding Parts of Congruent Triangles are Congruent
53. Midsegment of a triangle:
Joins the midpoints. 1/2 length of the longest and parallel to longest side
54. Concurrent:
Where lines intersect
55. Point of Concurrency
The point where lines intersect
56. Circumcenter
Lies on a perpendicular bisector
57. Perpendicular bisector
perpendicular and bisects a segment
58. incenter
Lies on the angle bisector
59. Median of a triangle
Joins vertex and midpoint
60. Centroid
Lies on medians
61. Altitude of a triangle
Joins vertex and perpendicular bisector
62. Ortocenter
lies on the altitude
63. Relationship between side lengths and angle measures:
longest side opposite largest angle, shortest dise opposite smallest angle
 Author: ghstechnology ID: 82463 Card Set: Geometry_semester_1.txt Updated: 2011-04-28 12:33:44 Tags: geometry Folders: Description: geometry Show Answers: