## 1. Corresponding Angles

### 1.1. The angles that occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal

## 2. Endpoint

### 2.1. A point at which a line segment or a ray ends

## 3. Vertex

### 3.1. each angular point of a polygon, polyhedron, or other figure.

## 4. Ray

### 4.1. a ray is a line with a single endpoint (or point of origin) that extends infinitely in one direction

## 5. Opposite Rays

### 5.1. Two rays with a common endpoint that point in opposite directions and form a straight line

## 6. Segment

### 6.1. a part of a figure cut off by a line or plane intersecting it

## 7. Regular Plolygon

### 7.1. A regular polygon is a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length)

## 8. Isometry

### 8.1. An isometry is a transformation in which the original figure and its image are congruent.

## 9. Dilation

### 9.1. A dilation is a transformation (notation ) that produces an image that is the same shape as the original, but is a different size. A dilation stretches or shrinks the original figure.

## 10. Reduction

### 10.1. When an image's size is reduced, but is similar to the original image

## 11. Enlargement

### 11.1. a kind of transformation that changes the size of an object. The image created is similar to the object

## 12. Center of Dilation

### 12.1. The center of dilation is a fixed point in the plane about which all points are expanded or contracted

12.1.1. https://www.khanacademy.org/math/geometry-home/transformations/dilations-scaling/v/dilating-from-an-arbitrary-point-example