Springboard Unit 1 Vocabulary

Front 1

Geometry

Back 1

Earth Measurements

Front 2

Point

Back 2

small dot
no dimension

Front 3

Line

Back 3

Extends in one dimension
striaght

Front 4

Plane

Back 4

exstends in two dimensions
<------------>

Front 5

Line Segment

Back 5

has end points
*----------*

Front 6

ray

Back 6

has one end point and one arrow head
*-------->

Front 7

Intersection

Back 7

the set of points that a figure has incommon

Front 8

Collinear

Back 8

points on the same line

Front 9

Noncollinear

Back 9

points that dont lie on the same line

Front 10

Coplanar

Back 10

lines that lie in the same plane

Front 11

Noncoplanar

Back 11

not in the same plane

Front 12

Parallel Lines

Back 12

they are coplanar and do not intersect

Front 13

Perpendicular Lines

Back 13

two lines that for a right angle

Front 14

Skew Lines

Back 14

lines that do not intersect and are not coplanner

Front 15

Oblique Lines

Back 15

lines that intersect, but are not perpendicular

Front 16

Angle

Back 16

two rays that share the same intital point
_->
*-------->

Front 17

Vertex

Back 17

intial point

Front 18

Acute Angle

Back 18

less than 90

Front 19

Right Angle

Back 19

90

Front 20

Obtuse Angle

Back 20

more than 90

Front 21

Straight Angle

Back 21

180 degrees

Front 22

Adjacent Angle

Back 22

if they share a common vertex and side, but have no common interior points

Front 23

Complementary Angles

Back 23

angles add up to = 90

Front 24

Supplementary Angles

Back 24

angles add up to = 180

Front 25

Linear Pair

Back 25

/\
\
A \ B
<-----------*---------->

Front 26

Linear Pair Postulate

Back 26

if two angles form a linear pair, then they are supplementry

Front 27

Vertical Angles

Back 27

opposite

Front 28

Vertical Angles Theorem

Back 28

vertical angles are congruent

Front 29

Congruent Angles

Back 29

angles that have the same meausure ment

Front 30

Segment Addition postulate

Back 30

ab+bc=ac

Front 31

Angle Addition Postulate

Back 31

<car+<rat=cat

Front 32

Congruent Segments

Back 32

segments with the same lenght

Front 33

Midpoint

Back 33

point that divides the segments into two congruent segments

Front 34

Angle Bisector

Back 34

ray that splits angles into 2 equal angles

Front 35

Radius

Back 35

the distance from the center to a point on the circle

Front 36

Diameter

Back 36

the distance across the circle throught the center

Front 37

Chord

Back 37

a segment whose end points are points on the circle

Front 38

Circle

Back 38

the set of all points in a place that are equidistant from the center

Front 39

Center of a circle

Back 39

the center of a circle

Front 40

Concentric Circles

Back 40

coplanar circles that have a common center

Front 41

Interior of a Circle

Back 41

consist of the point that are inside the circle

Front 42

Exterior of a Circle

Back 42

consist of the point outside of the circle

Front 43

Inductive Reasoning

Back 43

looking for patterns and making statment

Front 44

Deductive Reasoning

Back 44

conditional statements

Front 45

Conjecture

Back 45

an unproven statement that is based on observation

Front 46

Postulate

Back 46

rules that are excepted without proof

Front 47

Theorem

Back 47

a true statement that results as a result of other true statements

Front 48

Proof

Back 48

an argument that follows deductive reasoning

Front 49

Two-Column Proof

Back 49

numbered statements and reasons that show the logical order of an argument

Front 50

Conditional Statement

Back 50

if then statement