Unit 5

Question 1

acute angle

Answer 1

an angle measuring less than 90° but greater than 0°

Question 2

angle

Answer 2

A figure created by two distinct rays that share a common endpoint (also known as a vertex).

Question 3

angle of rotation

Answer 3

The amount of rotation (in degrees) of a figure about a fixed point such as the origin.

Question 4

bisector

Answer 4

A point, line or line segment that divides a segment or angle into two equal parts.

Question 5

circle

Answer 5

The set of all points equidistant from a point in a plane.

Question 6

congruent

Answer 6

Having the same size, shape and measure.

Question 7

corresponding angles

Answer 7

Angles that have the same relative position in geometric figures.

Question 8

corresponding sides

Answer 8

Sides that have the same relative position in geometric figures

Question 9

endpoint

Answer 9

The point at each end of a line segment or at the beginning of a ray.

Question 10

image

Answer 10

The result of a transformation.

Question 11

intersection

Answer 11

The point at which two or more lines intersect or cross.

Question 12

isometry

Answer 12

a distance preserving map of a geometric figure to another location using a reflection, rotation or translation.

Question 13

line

Answer 13

One of the undefined terms of geometry that represents an infinite set of points with no thickness and its length continues in two opposite directions indefinitely

Question 14

line segment

Answer 14

A part of a line between two points on the line

Question 15

line of symmetry

Answer 15

a line separating a figure into two halves that are mirror images.

Question 16

line symmetry

Answer 16

exists for a figure if for every point on one side of the line of symmetry, there is a corresponding point the same distance from the line

Question 17

obtuse angle

Answer 17

an angle measuring greater than 90° but less than 180°

Question 18

parallel lines

Answer 18

Two lines are parallel if they lie in the same plane and do not intersect.

Question 19

perpendicular lines

Answer 19

Two lines are perpendicular if they intersect to form right angles.

Question 20

point

Answer 20

One of the basic undefined terms of geometry that represents a location.

Question 21

pre-image

Answer 21

A figure before a transformation has taken place.

Question 22

ray

Answer 22

A part of a line that begins at a point and continues forever in one direction

Question 23

reflection

Answer 23

A transformation of a figure that creates a mirror image, “flips,” over a line.

Question 24

line of reflection

Answer 24

A line that acts as a mirror so that corresponding points are the same distance from the mirror.

Question 25

rotation

Answer 25

A transformation that turns a figure about a fixed point through a given angle and a given direction, such as 90° clockwise.

Question 26

regular polygon

Answer 26

a two-dimensional figure with all sides and all angles congruent

Question 27

right angle

Answer 27

an angle measuring 90˚

Question 28

transformation

Answer 28

The mapping, or movement, of all points of a figure in a plane according to a common operation, such as translation, reflection or rotation.

Question 29

translation:

Answer 29

A transformation that slides each point of a figure the same distance in the same direction.

Question 30

vertex

Answer 30

The location at which two lines, line segments or rays intersect.