Question

chapter 4 vocabulary quiz

1. a function that moves or changes a figure in some way to produce a new figure is called

__________________________.

1. another name for the original figure is the
2. the new figure after the transformation is called the
3. moving every point of a figure the same distance in the same direction is called a
4. a transformation that preserves length and angle measure is called
5. a transformation that uses a line like a mirror to reflect a figure is called
6. a line like a mirror to reflect a figure is called the
7. a transformation in which a figure is turned about a fixed point is called a
8. rotation postulate: a rotation is a

motion.

1. two geometric figures that are rigid motion or a composition of rigid motions that maps one of the

figures to the other are

1. a transformation in which a figure is enlarged or reduced with respect to a fixed point is called
2. the ratio of the lengths of the corresponding sides of the image and the preimage is called
3. 3. when the scale factor ( k>1 ), a dilation is an
4. 4. when ( 0<k<1 ), a dilation is a

Explanation:

1. A transformation changes a figure to produce a new one.
2. The original figure is called the pre - image.
3. The new figure after transformation is the image.
4. Moving all points of a figure the same distance and direction is a translation.
5. A transformation that preserves length and angle measure is a rigid transformation.
6. Using a line like a mirror to reflect a figure is a reflection.
7. The line used for reflection is the line of reflection.
8. Turning a figure about a fixed point is a rotation.
9. Rotation is a circular motion.
10. Figures related by rigid motion or composition of rigid motions are congruent.
11. Enlarging or reducing a figure about a fixed point is a dilation.
12. The ratio of corresponding side lengths is the scale factor.
13. When \(k>1\), dilation is an enlargement.
14. When \(0 < k<1\), dilation is a reduction.

Answer:

1. transformation
2. pre - image
3. image
4. translation
5. rigid transformation
6. reflection
7. line of reflection
8. rotation
9. circular
10. congruent
11. dilation
12. scale factor
13. enlargement
14. reduction