Flashcards in Chapter 1 Deck (77):

1

## is made up pf points and lines, has no thickness or width. exactly one through two points

### line

2

## flat surface made of 3 or more points. extends infinitely in all directions. made of 3 non co-lin points

### plane

3

## a line with 2 distinct endpoints

### line segment

4

## part of a line that has one endpoint. extends infinitely in one direction.

### ray

5

## two collinear rays that form a line

### opposite rays

6

## Points that lie on the same line

### Co-linear points

7

## Points that do not lay on the same line

### non co-linear points

8

## Set of all the points two geometric figures have in common

### Intersection

9

## 2 lines that never intersect

### parallel lines

10

## boundless, 3 dimensional set of all points. can contain lines and points

### space

11

## points that lie on the same plane

### coplanar points

12

## points that do not lie on the same plane

### non co-planar points

13

## all of the elements in a combined set

### union

14

## 2 lines that intersect at exactly 1 point and form a right angle

### perpendicular lines

15

## Notate: point X

### X

16

## Notate: line G

### cursive lowercase g

17

## Notate: Line RG

###

RG

18

## Notate: Collinear points M, N, O

### co-lin M,N,O

19

## Notate: non collinear points A,B,C

### non co-lin A,B,C

20

## Notate: Plane F

### Uppercase, Cursive, F

21

## notate: plane HTB

### Plane HTB

22

## Notate: Coplanar Points V,W,X

### Co-pl V,W,X

23

## Notate: Non co-planar C, D, E, F

### non co-pl C, D, E, F

24

## Notate: Segment PQ

###
------

PQ

25

## if PM+ MQ= PQ, M is (between, preceding) points P and Q

### between

26

## segments that have the same measure. slashes on figures denote this

### congruent segments

27

## the point halfway between the endpoints of a segment

### midpoint

28

## any segment, line, or plane that intersects a segment at its midpoint

### segment bisector

29

## Midpoint Formula on a Number Line

### (x1+x2)/2

30

## Midpoint formula in a coordinate plane

### ((x1+x2)/2, (y1+y2)/2)

31

## The length of the segment between two endpoints

### Distance between two points

32

## Distance Formula on a Number Line

### |x2-x1|

33

## Distance Formula

###
SQUARE ROOT OF...

(x2-x1)^2+ (y2-y1)^2

34

## A location, neither shape nor size

### point

35

## Is formed by 2 noncollinear rays that have a common endpoint

### Angle

36

## Decribe how to name an angle.

### Three letters, vertex is ALWAYS in the middle. Can be named by number if given or vertex only if it is the only angle formed by the vertex

37

## Sides of an angle

### 2 rays that make up an angle

38

## Vertex

### Common endpoint of an angle

39

## Acute Angle

### angle with a measure less than 90*

40

## Right angle

### Angle with measure of 90*

41

## Angle with measure over 90*, less than 180*

### Obtuse Angle

42

## Straight angle

### Angle with a measure of 180*

43

## Congruent Angles

### Angles with the same measure

44

## Angle bisector

### A ray that divides an angle into two congruent angles

45

## Complementary Angles

### Angles with measures that add up to 90*

46

## Supplementary Angles

### Angles with measures that add up to 180*

47

## Adjacent Angles

### Two angles that lie in the same plane and share a common vertex and a common side, but have NO common interior points

48

## Linear pair

### Two adjacent angles with a sum of 180*

49

## Vertical Angles

### two nonadjacent angles formed by two intersecting lines

50

## Vertical Angles are (always, sometimes, never) congruent

### always

51

## Perpendicular Lines, Congruent Angles, and Congruent Segments (can, cannot) be assumed

### Cannot

52

## Polygon

### Closed Figure in a plane that is formed by 3 or more line segments. No two sides are collinear

53

## Vertex of a Polygon

### Where two sides of the polygon meet

54

## Convex Polygon

### No line that contains a line of the polygon also contains an interior point of the polygon

55

## Concave Polygon

###
If a line that DOES contain a side of the polygon also contains an interior point.

CAVES in.

56

## Equilateral Polygon

### Occurs if all sides are congruent

57

## Equiangular Polygon

### Occurs if all angles are congruent

58

## Regular Polygon

###
Polygon that is

-equilateral

-equiangular

-convex

59

## Irregular Polygon

### Not a regular polygon

60

## Polygon with 3 sides

### Triangle

61

## Polygon with 4 sides

### Quadrilateral

62

## Polygon with 5 sides

### Pentagon

63

## Polygon wth 6 sides

### Hexagon

64

## Polygon with 7 sides

### Heptagon

65

## Polygon with 8 sides

### Octagon

66

## Polygon with 9 sides

### nonagon

67

## Polygon with 10 sides

### Decagon

68

## Polygon with 12 sides

### Dodecagon

69

## Polygon with n sides

### n-gon

70

## Area of a triangle

### (1/2)bh

71

## Perimeter of a triangle

### b+c+d

72

## Perimeter of a square

### 4s

73

## Area of a square

### s^2

74

## Perimeter of a rectangle

### 2l+2w

75

## Area of a rectangle

### lw

76

## Circumference of a circle

### 2πr

77