Point

1
Point
An exact position or location in a given
plane. Is represented by a dot and named with a
capital letter.
Point A or Point B
2
Line
The set of points between points in a plane and
the infinite number of points that continue
beyond the points. Written as
Q
P
3
Line Segment
A line with two endpoints. Written as
4
Distance along a line
The linear distance between two points on a given
line.
5
Parallel Line
Lines in a plane that either do not share any
points and never intersect, or share all
points. Written as
6
Perpendicular Line
Two lines that intersect at a right angle
(90). Written as
7
Ray

• A line that has one endpoint and continues on
  forever in the opposite direction.

B
D
C
E
A
8
Angle

• A shape, formed by two lines or rays diverging
  from a common point (the vertex).

The angle is
9
Right Angle

An angle that measures 90.
10
Acute Angle
An angle measuring less than 90 but greater than
0.
11
Obtuse Angle
An angle measuring greater than 90 but less than
180.
12
Straight Angle
An angle measuring exactly 180.
13
Adjacent Angles
Two angles that share a common vertex and side.
SIDE BY SIDE
14
Linear Pair
Two adjacent angles that form a straight line.
1
2
15
Vertical Angles
Two angles directly across from each other. They
share a common vertex. E G and H F are
vertical anlges.
16
Supplementary Angles
Two angles that add up to 180.
1
2
17
Complementary Angles
Two angles that add up to 90 degrees.
1
2
18
Circle

• The set of all points in a plane equidistant from
  a certain point called the center.

19
One-to-One
A relationship wherein each point in a set of
points is mapped to exactly one other point.
20
Pre-image
The original figure before undergoing a
transformation.
21
Image
The new, resulting figure after a transformation
22
Isometry
A transformation in which the preimage and image
are congruent preserving length and angles
measure and distance between lines
23
Transformations are called RIGID if every image
is congruent to its preimage.
Rigid transformations can also be referred to as
an ISOMETRY.
Every segment is congruent to its image.
24
Congruent
Figures are congruent if they have the same
shape, size, lines, and angles.
25
Similar Triangles
Triangles are similar if they have the same shape
but have different sizes.
26

• To divide into two congruent parts.

L
BISECT
J
K
M
 
27
Line of Symmetry

• the imaginary line where you could fold the image
  and have both halves match exactly

28
Find the value of each variable, given that the
transformation is an isometry.
29
Which of the following are rigid transformations?
(Isometry)