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1

undefined term

ex; point, line, plane

2

point

a location, has neither size or shape

3

line

made up of points and has no thickness or width

4

plane

a flat surface made up of points that extends indefinitely in all directions

5

collinear

points that lie on the same line

6

coplanar

points that lie on the same plane

7

intersection

The set of points they have in common, two lines intersect at one point

8

definition

explained using undefined terms and/or other defined terms

9

defined term

explained using undefined terms and/or other defined terms

10

space

defined as boundless

11

line segment

a straight line which links two points without extending beyond them

12

betweenness of points

a point is between two other points on the same line

13

between

in a space separating two objects

14

congruent segments

segments that have the same measure

15

construction

methods of creating geometric figures without the benefit of measuring tools

16

distance

the length of the segment with those points as its endpoints

17

midpoint

the point halfway between the endpoints of the segment

18

segment bisector

any segment, line or plane that intersects a segment at its midpoint

19

ray

a part of a line

20

opposite rays

two rays with a common endpoint that point in opposite directions and form a straight line.

21

angle

formed by two noncollinear rays that have a common endpoint

22

side

the rays

23

vertex

the common endpoint

24

interior

the space inside of an angle

25

exterior

the space outside of an angle

26

degree

a measurement of plane angle; 1/360

27

right angle

an angle whose measure is exactly 90°

28

acute angle

an angle whose measure is less than 90°

29

obtuse angle

an angle whose measure is greater than 90° and less than 180°

30

angle bisector

a ray that divides an angle into two congruent angles

31

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

32

linear pair

a pair of adjacent angles with no common sides that are opposite rays

33

vertical angles

two adjacent angles formed by two intersecting lines

34

complementary angles

two angles with measures that have a sum of 90

35

supplementary angles

two angles with measures that have a sum of 180

36

perpendicular

lines, segments, rays that form right angles

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