Unit 4 – Flip, Slide & Turn

Unit 4 – Flip, Slide & Turn

Vocabulary

Unit 4 – Flip, Slide & Turn - Vocabulary

Plane: One of the basic undefined

terms of geometry. A plane goes on

forever in all directions (in two-

dimensions) and is "flat" (i.e., it has

no thickness).

Line Segment: The part of a line

between two points on the line.

Sometimes referred to as a segment.



Line: A line has no thickness but its

length goes on forever in two

directions.


Point: A point has no length, width, or

thickness, and we often use a dot to

represent it.


Endpoint: The point at an end of

a line segment or ray.


Intersection: The point at which

two or more lines, rays, or line

segments meet or cross.


Ray: A ray begins at a

point and goes on forever

in one direction.


Angle: Region between

two rays or the amount of

rotation about a fixed

point.


Parallel Lines: Two lines that

lie in the same plane and they

do not intersect (cross) and

would not ever cross if they were

extended (railroad tracks).


Perpendicular Lines:

Two lines, rays or line

segments that meet or

cross at a right angle.


Corresponding Angles:

Angles that have the same

relative positions in

geometric figures.


Corresponding Sides:

Sides that have the same

relative positions in

geometric figures.


Congruent: Having the same

size, shape and measure.


Transformation: The

mapping, or movement, of all

the points of a figure in a plane

according to a common

operation.


Translation: A transformation

that "slides" each point of a

figure the same distance in the

same direction.


Reflection: A

transformation that "flips"

a figure over a mirror or

reflection line.


Reflection Line: A line that acts

as a mirror in the form of a

perpendicular bisector so that

corresponding points are the

same distance from the mirror.


Rotation: A transformation

that turns a figure about a fixed

point at a given angle and a

given direction.


Bisector of a line: the straight

line or ray that divides a line

segment or angle into two

congruent segments.


Angle of Rotation: The

number of degrees that a

figure is rotated about a

fixed point.


Coincide: To occupy

the same position in

space; correspond

exactly or be identical.


Skew: Lines not in a

plane that don’t meet.


Right Angle: An angle

that measures 90°.


Obtuse Angle: An angle

that measures more than

90° but less than 180 °.


Acute Angle: An

angle that measures

less than 90°.


Vertex: a point at which

two or more sides or

edges of a geometric

figure meet.


Dilation: a change in the

size of an object without

changing the shape.


Similar: Figures that

have the same shape.


Scale factor: the ratio of the

lengths of corresponding

sides in similar figures.


Supplementary angles – Two angles whose measures, when added together, equal 180 degrees.


Complementary angles – Two angles whose measures, when added together, equal 90 degrees.

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Unit 4 – Flip, Slide & Turn