Geometry Vocabulary

Front 1

Postulate
The intersection of two lines is a _______

Back 1

Point

Front 2

Postulate
The intersection of two planes is a ______

Back 2

Line

Front 3

Postulate
Through any two points there is exactly one and only one ______

Back 3

Line

Front 4

Postulate
Through any three noncollinear points there is exactly one _______

Back 4

Plane

Front 5

Postulate
If two points are in a plane, then the line containing them is in the _______

Back 5

Plane

Front 6

Segment Congruence Postulate
If two segments have the same length as measured by a given fair ruler, then the segments are _______. If the two segments are congruent, then they have the same __________.

Back 6

Congruent, length

Front 7

Segment Addition Postulate
If point R is between points P and Q on a line, then PR+RQ= ?

Back 7

PQ

Front 8

Angle Addition Postulate
If point S is the interior of <PQR, then <PQS + m<SQR= ?

Back 8

m<PQR

Front 9

Angle Congruence Postulate
If two angles have the measure, then they are __________. If two angles are congruent, then they have the _______ measure.

Back 9

Congruent, same

Front 10

Linear Pair Property
If two angles form a linear pair, then they are _____________

Back 10

Supplementary

Front 11

Acute angle
(less than)

Back 11

Angle less than 90 degrees

Front 12

Angle
(with a degree)

Back 12

Two rays joined at a common point (vertex)

Front 13

Angle bisector
(Half of)

Back 13

A line that goes through the center of an angle's interior

Front 14

Center of rotation
(middle of)

Back 14

A point at which the figure is rotated

Front 15

Circumcenter
(Triangle in)

Back 15

A circle with a triangle touching all three points on the circle's sides

Front 16

Circumscribed circle
(Circle inside)

Back 16

A circle in a triangle that has three sides touching the interior of the triangle.

Front 17

Collinear
(Same _____)

Back 17

Points on the same line

Front 18

Complement
(complementary?)

Back 18

50 degree angle plus 40 degree angle

Complement would be 50 or 40 to 50 or 40

Front 19

Complementary angles
(Add up to...)

Back 19

Angles that add up to 90 degrees

Front 20

Concurrent
(Traffic jam)

Back 20

3 or more lines meet at the same point

Front 21

Congruent
(same)

Back 21

Something that is the same degree, length etc

Front 22

Conjecture
(Educated guess)

Back 22

A guess based off of knowledge

Front 23

Coordinate of a point
(x,y)

Back 23

(3,2) (4,5) on a coordinate graph

Front 24

Coplanar
(Boeing 747)

Back 24

Points on the same plane

Front 25

Degree
(angle measure unit)

Back 25

A measure onhow much the angle is bent

Front 26

Endpoint
(End of .)

Back 26

A dot at the end of a ray

Front 27

Exterior
(Outside of)

Back 27

Outside of the rays of the angle sides

Front 28

Image
(End product of...)

Back 28

End product of a kind of transformation

Front 29

Incenter
(circle in)

Back 29

Circle inside triangle

Front 30

Inscribed circle
(Triangle in)

Back 30

Triangle in circle

Front 31

Interior
(Inside of <)

Back 31

Inside an angle's rays

Front 32

Intersect
(crossing)

Back 32

crossing

Front 33

Intersection
(Beaver and Broad st)

Back 33

Two figures run into each other

Front 34

Length
(How long is....?)

Back 34

a measure of how long something is

Front 35

Line
(Pencil, chair leg,)

Back 35

A line goes on forever

Front 36

Linear Pair
(Equals a degree of three digits)

Back 36

Equals 180 degrees

Front 37

Measure of an angle
(Protractor)

Back 37

Measure an angle to find its degrees

Front 38

midpoint
(center)

Back 38

Middle of a figure

Front 39

Number line
(1-2-3-4)

Back 39

A line of numbers

Front 40

Obtuse angle
(larger than....?)

Back 40

An angle larger than 90 degrees

Front 41

Parallel lines
(Never going to.....?)

Back 41

Never going to intersect

Front 42

Perpendicular bisector
(Middle of.... measures what degree?)

Back 42

Middle of a line measures 90 degrees

Front 43

Perpendicular lines
(measures what degree?)

Back 43

Equals 90

Front 44

Plane
(Desk, floor)

Back 44

A geometric table where lines points rays exist

Front 45

Point
(Desks on a floor)

Back 45

points are zero-dimensional; i.e., they do not have volume, area, length, or any other higher-dimensional analogue

Front 46

Postulate
(always true)

Back 46

Something that is always true

Front 47

Preimage
(Before a....)

Back 47

before a transformation

Front 48

Ray
(goes one direction)

Back 48

Point and line

Front 49

Reflection
(mirror)

Back 49

When a figure is transformed in the form of a reflection

Front 50

Right angle
(will always measures what?)

Back 50

90 degrees

Front 51

Rigid transformation
(moves where?)

Back 51

Moves on a coordinate plane

Front 52

Rotation
(spin at a point)

Back 52

Spins at a point

Front 53

Segment
(Point)

Back 53

Line that has two endpoints

Front 54

Segment bisector
(middle of a)

Back 54

middle of a segment

Front 55

Sides of an angle
(Are made of what?)

Back 55

Rays

Front 56

Supplement
(adds up to)

Back 56

180 degrees
170 + 10

Front 57

Supplementary angles
(will always add up to....?)

Back 57

180 degrees

Front 58

Translation
(moves which direction)

Back 58

Moves horizontal

Front 59

Vertex of an angle
(sharp end)

Back 59

Beginning of an angle