Term 1

The intersection of to lines is a ...

Definition 1

 

point

Term 2

angle

Definition 2

A figure formed by two rays with a common endpoint.

Term 3

collinear

Definition 3

Points lying on the same line.
-

Term 4

coplanar

Definition 4

Points lying on the same plane.

Term 5

intersect

Definition 5

Two or more points in common.

Term 6

line

Definition 6

An undefined term in geometry, understood to be perfectly straight, has no thickness, contain and infinite amount of points, and extend infinitely in both directions.s.
-

Term 7

plane

Definition 7

An undefined term in geometry, which is understood to be a flat surface that extends infinitely in all directions.

Term 8

point

Definition 8

An undefined term in geometry, that can be thought of as a dot that represents a location in space that has no size.

Term 9

postulate

Definition 9

A statement that is accepted as true without proof.
-

Term 10

ray

Definition 10

A part of a line that starts at a point and extends infinitely in one direction.

Term 11

segment

Definition 11

A part of a line that begins at one point and ends that another.

Term 12

vertex of an angle

Definition 12

The point in common of the two rays that form an angle.
-

Term 13

The intersection of two planes is a ...

Definition 13

line.

Term 14

Through any two points there is one and only ...

Definition 14

line

.

Term 15

Through any three noncollinear points there is one and only one...

Definition 15

plane.
-

Term 16

If there are two points in a plane, then the line containing them is in the ...

Definition 16

plane.

Term 17

congruent

Definition 17

The relationship between figures having the same size and shape.

Term 18

length

Definition 18

The distance from one endpoint to another.

abs val ( a - b ) or

abs val ( b - a )
-

Term 19

Segment Congruence Postulate

Definition 19

If two segments have the same length as measured by a fair ruler, then the segments are congruent. Also, if two segments are congruent, then they have the same length as measured by a fair ruler.

Term 20

Segment Addition Postulate (line including points PQR)

Definition 20

If point Q is between points P and R on a line, then PQ + QR = PR



.

Term 21

acute angle

Definition 21

An angle whose measure is less than 90 degrees.
-

Term 22

complementary angles

Definition 22

Two angles whose measure has a sum of 90 degrees.

Term 23

linear pair of angles

Definition 23

These angles are created when two lines intersect. The measure of the line is 180 degrees, so the angles must also sum 180 degrees.

Term 24

obtuse angle

Definition 24

An angle whose measure is greater than 90 degrees.
-

Term 25

right angle

Definition 25

An angle whose measure is 90 degrees.

Term 26

supplementary angles

Definition 26

Two angles whose sum has a measure of 180 degrees.

Term 27

Angle Addition Postulate

Definition 27

Angle Addition Postulate states that if a point S lies in the interior of ∠PQR, then ∠PQS + ∠SQR = ∠PQR.
-

Term 28

Angle Congruence Postulate

Definition 28

If angles have the same measure, then they are congruent. If two angles are congruent, then they have the same measure.

Term 29

Linear Pair Property

Definition 29

If two angles form a linear pair, then they are supplementary.

Term 30

angle bisector

Definition 30

A ray that divides an angle into two congruent angles.
-

Term 31

center of rotation

Definition 31

The point at which an image rotates around.

Term 32

circumcenter

Definition 32

The center of a circumscribed circle; the point which the three perpendicular bisectors of the sides of a triangle intersect.

Term 33

circumscribed circle

Definition 33

A circule that is drawn around the outside a triagle and contains all three vertices.
-

Term 34

concurrent

Definition 34

Literally, "running together"; of three or more lines, intersecting at a single point.

Term 35

conjecture

Definition 35

A statement that is believed to be true.

Term 36

endpoint

Definition 36

A point at an end of a segment or the starting point of a ray.
-

Term 37

incenter

Definition 37

The center of an inscribed circle; the point where the three angle bisectors of a triangle intersect.

Term 38

inscribed circle

Definition 38

Is a circle inside a triangle that touches each side of the triangle at one point.

Term 39

midpoint of a segment

Definition 39

The point that divides a segment into two congruent segments.
-

Term 40

parallel lines

Definition 40

Coplanar lines that never intersect.

Term 41

perpendicular bisector

Definition 41

A line that is perpendicular to a segment at its midpoint.

Term 42

perpendicular lines

Definition 42

Lines that intersect to form right angles.
-

Term 43

preimage

Definition 43

A shape that undergoes a motion or a transformation.

Term 44

reflection

Definition 44

A transformation that creates a mirror image.

Term 45

rotation

Definition 45

A transformation where the image is rotated around a single point.
-

Term 46

translation

Definition 46

A transformation in which every point on the image moves/slides the same direction.

Term 47

rigid transformation

Definition 47

A transformation that does not change the shape or size of a figure.