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Flashcards in Geometry Deck (55)
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1

A point

has no size and is the simplest geometric figure.

2

All geometric figures consist of

points

3

A line

is understood to be a straight line that extends in both directions without end.

4

A plane

can be thought of as a floor or a tabletop, except that a plane extends in all directions without end and has no thickness.

5

Given any two points on a line, a line segment is

the part of the line that contains the two points and all the points between them.

6

Given any two points on a line, a line segment is the part of the line that contains the two points and all the points between them. The two points are called

endpoints

7

congruent line segments

Line segments that have equal lengths

8

midpoint

The point that divides a line segment into two congruent line segments

9

line segments BC and CD are

congruent

10

point c is 

halfway between B and D, point C is the midpoint of line segment BD.

11

Sometimes the notation AB denotes line segment AB, and sometimes it denotes the

length of line segment AB

12

When two lines intersect at a point, they form

four angles

13

When two lines intersect at a point, they form four angles. Each angle has

a vertex at the point of intersection of the two lines.

14

APC and BPD, are called

opposite angles, also known as vertical angles

15

Opposite angles have

equal measures

16

congruent angles

angles that have equal measures

17

Sometimes the angle symbol  is used instead of the word

angle

18

perpendicular lines

Two lines that intersect to form four congruent angles

19

Two lines that intersect to form four congruent angles are called perpendicular lines. Each of the four angles has a measure of

90º

20

An angle with a measure of 90º is called a

right angle

21

this means

perpendicular

22

acute angle

An angle with measure less than 90º

23

obtuse angle

an angle with measure between 90º and 180º

24

parallel lines

Two lines in the same plane that do not intersect

25

parallel

26

when two parallel lines are intersected by a third line it formes ...... angle/s

8

27

Label the angles of two parallel lines intersected by a third line

28

x+y=

180

29

polygon

a closed figure formed by three or more line segments

30

sides

line segments