Unit 1 Test Review

Front 1

Undefined Terms

Back 1

Words, usually readily understood, that are not formally explained by means of more basic words and concepts. The basic undefined terms of geometry are point, line, and plane.

Front 2

point

Back 2

A location; has no shape or size.

Front 3

Line

Back 3

Made of points; no thickness/width

Front 4

plane

Back 4

flat surface

Front 5

collinear

Back 5

points on the same line

Front 6

coplanar

Back 6

points on the same plane

Front 7

intersection

Back 7

Objects cross at a common point, line, or plane.

Front 8

Space

Back 8

a boundless, three-dimensional set of all points

Front 9

Line Segment

Back 9

Part of a line with two endpoints.

Front 10

betweenness of points

Back 10

For any two points A and B on a line, there is another point C between A and B if and only if A, B, and C are collinear and AC + BC = AB.

Front 11

between

Back 11

For any two points A and B on a line, there is another point C between A and B if and only if A, B, and C are collinear and AC + BC = AB.

Front 12

congruent segments

Back 12

Line Segments are equal.

Front 13

ray

Back 13

part of a line; one endpoint.

Front 14

opposite rays

Back 14

Two rays with a common endpoint; forms a straight line.

Front 15

Angle

Back 15

created by two noncollinear rays with one common endpoint

Front 16

sides

Back 16

The rays of an angle

Front 17

vertex

Back 17

common endpoint of an angle

Front 18

interior

Back 18

a point is in the interior of an angle if it does not lie on the angle itself and it lies on a segment with endpoints that are on the sides of the angle.

Front 19

exterior

Back 19

a point is in the exterior of an angle if it is neither on the angle nor in the interior of the angle.

Front 20

degree

Back 20

A unit of measure used in measuring angles and arcs.

Front 21

right angle

Back 21

angle in which the measurement is 90 degrees.

Front 22

acute angle

Back 22

angle in which the measurement is less than 90 degrees.

Front 23

obtuse angle

Back 23

angle in which the measurement is greater than 90 degrees.

Front 24

angle bisector

Back 24

Ray that divides an angle into two equal halves.

Front 25

adjacent angles

Back 25

Two angles that lie in the same plane, have a common vertex and a common side, but no common interior points.

Front 26

linear pair

Back 26

2 angles that create a straight line

Front 27

vertical angles

Back 27

nonadjacent angles created by two intersecting lines; congruent.

Front 28

complementary angles

Back 28

two angles with measures that have a sum of 90 degrees.

Front 29

supplementary angles

Back 29

two angles with measures that have a sum of 180 degrees.

Front 30

perpendicular lines

Back 30

2 intersecting lines that make a 90 degree angle.

Front 31

inductive reasoning

Back 31

reasoning that requires a number of specific examples to arrive at a conclusion.

Front 32

conjecture

Back 32

educated guess

Front 33

counterexample

Back 33

example that makes the conjecture false

Front 34

deductive reasoning

Back 34

process of using logic to draw conclusions from given facts, definitions, rules, laws & properties.

Front 35

valid

Back 35

correct

Front 36

Law of Detachment

Back 36

(1)If H then C

(2)If H is true

(3)C must be true

Front 37

Law of Syllogism

Back 37

(1)If p->q and

(2)q->r are true statements, then

(3)p->r is a true statement.