Chapter 1

Question 1

Undefined terms

Answer 1

most basic figures in geometry which cannot be defined by using other figures.

Question 2

Point

Answer 2

Names a location and has no size. It is represented by a dot.

Question 3

Line

Answer 3

a straight path that has no thickness and extends forever.

Question 4

Plane

Answer 4

a flat surface that has no thickness and extends forever.

Question 5

Collinear

Answer 5

Points that lie on the same line

Question 6

Coplaner

Answer 6

points that lie in the same plane

Question 7

Segment

Answer 7

is the part of the line consisting of two points and all points between them.

Question 8

Endpoint

Answer 8

is a point at one end of a segment or the starting point of a ray

Question 9

Ray

Answer 9

part of a line that starts at an endpoint and extends forever in one direction.

Question 10

Opposite rays

Answer 10

two rays that have a common endpoint and form a line.

Question 11

Postulate

Answer 11

is a statement that is accepted as true without proof.

Question 12

Coordinate

Answer 12

A number used to identify the location of a point.

Question 13

Distance

Answer 13

between two points is the absolute value of difference of the coordinates.

Question 14

Length

Answer 14

The absolute value of the difference between coordinates a and b

Question 15

Congruent segments

Answer 15

segments that have the same length

Question 16

Construction

Answer 16

way of creating a figure that is more precise (using a compass and straight edge)

Question 17

Midpoint

Answer 17

point that bisects or divides the line into two congruent segments

Question 18

Segment bisector

Answer 18

Segment or a line that intersects a segment at a midpoint

Question 19

Angle

Answer 19

figure formed by two rays or sides with a common endpoint

Question 20

Vertex

Answer 20

point formed by two rays or segments

Question 21

Interior of an angle

Answer 21

the set of all points between the sides of the angle

Question 22

Exterior of an angle

Answer 22

is the set of points outside the angle

Question 23

Acute angle

Answer 23

Measures greater than 0 but less than 90

Question 24

Right angle

Answer 24

measures 90

Question 25

Obtuse angle

Answer 25

measures greater than 90 but less than 180

Question 26

Straight angle

Answer 26

formed by two opposite rays and measures 180

Question 27

Congruent angles

Answer 27

angles that have the same measure

Question 28

Angle Bisector

Answer 28

is a ray that divides an angle into two congruent angles

Question 29

Adjacent angles

Answer 29

two angles in the same plane with a common vertex and a common side, but no common interior points

Question 30

Linear Pair

Answer 30

pair of adjacent angles whose non common sides are opposite rays

Question 31

Complementary Angles

Answer 31

are angles that measure to have the sum of 90

Question 32

Supplementary angles

Answer 32

two angles who measures have a sum of 180

Question 33

Vertical Angles

Answer 33

two non-adjacent angles formed by two intersecting lines