Geometry 1.1-1.4

Front 1

Conjecture

Back 1

An unproven statement that is based on observations

Front 2

Inductive Reasoning

Back 2

A process that includes looking for patterns and making conjectures

Front 3

Counterexample

Back 3

An example that shows a conjecture is false

Front 4

Three Undefined Terms in Geometry

Back 4

Line, point, plane

Front 5

Point

Back 5

Has no dimensions, represented by a small dot

Front 6

Line

Back 6

No width, extends infinitly in both directions

Front 7

Plane

Back 7

Has no thickness, extends indefinitely in all directions.

Front 8

Collinear Points

Back 8

Points that lie on the same line

Front 9

Coplaner Points

Back 9

Points that lie on the same plane

Front 10

Line Segment, Endpoint

Back 10

Part of a line that consists of two points called endpoints and all points on the line between it's endpoints

Front 11

Ray, Initial Point

Back 11

Part of a line that consists of an initial point and all points on the line that extend in one direction

Front 12

Opposite Rays

Back 12

If C is between A&B (ABC=collinear) then line CA and line CB are opposite rays

Front 13

Intersect

Back 13

To have one or more points in common

Front 14

Intersection

Back 14

The set of points that two or more geometric figures have in common

Front 15

Space

Back 15

The set of all points

Front 16

Postulates

Back 16

Rules that are excepted without proof

Front 17

Coordinate

Back 17

The real numbers that correspond to a point on a line

Front 18

Distance

Back 18

the absolute value of difference between two coordinates

Front 19

Length

Back 19

The distance between the two endpoints on a line segment

Front 20

Between

Back 20

When three points are collinear you can say that one is between the other two

Front 21

Distance formula

Back 21

d= square root (x2-x1)^2+(y2-y1)^2

Front 22

Congruent segments

Back 22

Two sements that have the same length

Front 23

Angle

Back 23

Consists of two different rays having the same initial point

Front 24

Know the sides and vertex of an angle

Back 24

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Front 25

Congruent angles

Back 25

Two angles that have the same measure

Front 26

Measure of an angle

Back 26

Found using a protractor

Front 27

Interior of an angle

Back 27

Any point inside the angle

Front 28

Exterior of an angle

Back 28

Outside the angle

Front 29

Acute angle

Back 29

Angle less than 90 degrees

Front 30

Right Angle

Back 30

90 degrees angle

Front 31

Obtuse angle

Back 31

Over 90 degrees

Front 32

Straight angle

Back 32

180 degrees

Front 33

Adjacent angles

Back 33

Two angles w/ a common vertex and side but no common interception points