Module 1

Question 1

Point

Answer 1

A specific location. Has no dimension. Its symbol is a dot.

Question 2

Line

Answer 2

A connected straight path. No thickness, continues forever in both directions.

Question 3

Plane

Answer 3

A flat surface. No thickness, extends forever in all directions.

Question 4

Segment

Answer 4

A portion of a line consisting of two endpoints and the points in between them.

Question 5

Ray

Answer 5

A portion of a line that starts at the endpoint and continues on forever in one direction.

Question 6

Coplanar

Answer 6

Points that lie on the same plane.

Question 7

Colinear

Answer 7

Points that lie on the same line.

Question 8

Postulate

Answer 8

A statement that is accepted as truth without a proof

Question 9

Postulate 1: Segment Addition Postulate

Answer 9

Let A, B, and C be colinear points. If B is between A and C, then AB + BC = AC

Question 10

Midpoint

Answer 10

Divides the line into two segments that have the same length.

Question 11

Bisector

Answer 11

A line, ray, or segment that passes through the midpoint of a segment.

Question 12

Angle

Answer 12

A figure formed by two rays with the same endpoint.

Question 13

Vertex

Answer 13

The common endpoint of the angle.

Question 14

Angle bisector

Answer 14

A ray that divides an angle into two angles that have the same measure.

Question 15

Postulate 2: Angle Addition Postulate

Answer 15

If S is in the interior of

Question 16

Transformation

Answer 16

A function that changes the position, shape, and/or size of a figure.

Question 17

Rigid Motion

Answer 17

The action of taking an object and changes its position without altering its shape or size (the figures will be congruent).

Question 18

Non-Rigid Motion

Answer 18

The action of taking an object and changing its size and/or shape.

Question 19

Preimage

Answer 19

The original figure before the transformation

Question 20

Image

Answer 20

The new figure that results from the transformation

Question 21

Reflection

Answer 21

A mirror image or a flip over a line of symmetry. Rigid motion

Question 22

Translation

Answer 22

A slide or glide. Rigid motion

Question 23

Rotation

Answer 23

A twist or turn around a point, defined using clockwise or counterclockwise. Rigid motion

Question 24

Dilation

Answer 24

Shrink or stretch the figure. Non rigid motion.

Question 25

Linear Pair Theorem

Answer 25

A pair of adjacent angles whose non-common sides are opposite rays.