NAME _____________________________________________ DATE ____________________________ PERIOD _____________
Chapter 9 Vocabulary
angle of rotation
line of reflection
plane symmetry
center of rotation
line of symmetry
rotational symmetry
composition of
line symmetry
symmetry
transformation
magnitude of symmetry
translation vector
glide reflection
order of symmetry
Choose from the terms above to complete each sentence.
1.________________
1. A(n)
?
is the composition of a translation followed by a reflection in
a line parallel to the translation vector.
2. ________________
2. A transformation representing a flip of a figure is called a(n)
3. ________________
?
.
3. A(n)
?
is a transformation that turns every point of a preimage
through a specified angle and direction about a fixed point.
4. A figure in the plane has
reflection in a line.
?
4. ________________
if the figure can be mapped onto itself by a
Write whether each sentence is true or false. If false, replace the underlined word or
phrase to make a true sentence.
5. ________________
5. A reflection is a transformation that moves all points of a figure the same distance in the
same direction.
6. ________________
6. A translation maps each point to its image along a vector called the translation vector.
7. ________________
7. When a figure can be folded so that the two halves match exactly, the fold is called a
line of reflection.
8. ________________
Choose the correct term to complete each sentence.
8. A(n) (isometry, composition) is a transformation made up of successive transformations.
9. A three dimensional figure has (axis symmetry, plane symmetry) if the figure can be
mapped onto itself by a rotation between 0° and 360°.
9. ________________
10. ________________
10. The rotation of a figure around a fixed point, called the (center of rotation, center of
symmetry), maps a point to its image.
11. ________________
Define each term in your own words.
11. center of rotation
Chapter 9