# Math Vocabulary 3-8-11

## 36 terms · this am some words i has put in quizlet

### Angle of rotation

angle formed by rays drawn from the center of rotation to a point and its image

### Center of rotation

the point about which a figure is rotated

### column matrix

a matrix with only one column

### component form

written form of a vector that combines the horizontal and vertical components <5,3>

### composition

a transformation made up of successive transformations

### Dilation

a transformation determined by a center point C and a scale factor k. when k>0, the image P' of P is the point on line CP such that CP' = |k| X CP. When k=0, the image P' of P is the point on the ray opposite line CP such that CP' = k X CP

### direct isometry

a transformation that preserves distance and orientations

### direction

the measure of the angle that a vector forms with the positive x-axis or any other horizontal line

### Equal vectors

two vectors that have the same magnitude and same direction

### glide reflection

A combination of a translation and a reflection.

### indirect isometry

An isometry that cannot be performed by maintaining the orientation of the points, as in direct isometry.

### isometry

equality of measure (e.g., equality of height above sea level or equality of loudness etc.)

### line of reflection

The line over which a figure is reflected. The vertices of the original and new figure are the same distance from this.

### line of symmetry

a line that divides a figure into two halves that are mirror images of each other

### magnitude

the length of a vector

### parallel vectors

vectors that have the same or opposite direction

### point of symmetry

every point on the figure on the opposite side of and equally distant from a central point

### reflection

a transformation representing a flip of the figure over a point, line, or plane

### reflection matrix

A matrix that can be multiplied by the vertex matrix of a figure to find the coordinate of the reflected image.

### regular tessellation

A regular polygon is repeated to fill a plane.

### resultant

a vector that is the sum of two or more other vectors

### rotation

a single complete turn (axial or orbital)

### rotational symmetry

the ability to rotate the figure around some point so that it concides with itself

### rotation matrix

transformation used to rotate the figure
[-10]
[0-1]

### scalar

a constant multiplied by a vector

### scalar multiplication

the multiplication of each entry in a matrix by the same number

### semi-regular tessellation

2 or more polygons are repeated to fill plane and vertices are identical

### similarity transformation

it maps figures into similar figures

### standard position

when the initial point of a vector is at the origin

### tessellation

a repeating pattern of plane figures that completely cover a plane with no gaps or overlaps

### transformation

in a plane, a mapping for which each point has exactly one image point and each image point has exactly one preimage point

### translation

a transformation that moves all points of a figure the same distance in the same direction

### translation matrix

a matrix that represents a translated figure
(x,y)=(x+?,y+?)

### uniform

tessellations containing the same arrangement of shapes and angles at each vertex

### vector

a directed segment representing a quantity that has both magnitude, or length, and direction

### vertex matrix

a matrix where all vertices of a polygon are placed in one matrix