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Transcript
Name
9-4
Class
Date
Practice
Form K
Symmetry
Tell what type(s) of symmetry each figure has. If it has line symmetry,
sketch the line(s) of symmetry. If it has rotational symmetry, tell the
angle of rotation.
1. To start, look for the ways that the figure will reflect
across a line onto itself.
2. Look for a possible center point.
Think about angles formed by joining image-preimage
pairs to the center. All these angles must be
for a
figure to have rotational symmetry.
3.
4.
5.
6.
Determine how many lines of symmetry each type of polygon has.
Include a sketch to support your answer.
7. equilateral triangle
8. square
9. regular pentagon
10. regular octagon
Prentice Hall Foundations Geometry • Teaching Resources
Copyright © by Pearson Education, Inc., or its affiliates. All Rights Reserved.
35
Name
Class
9-4
Date
Practice (continued)
Form K
Symmetry
11. Make a Conjecture What is the relationship between the number of sides of a
regular polygon and the number of lines of symmetry?
12. How many lines of symmetry are found in a regular polygon with 40 sides?
Tell whether each three-dimensional object has reflectional symmetry in a
plane, rotational symmetry about a line, or both.
13. a light bulb
14. a pair of pants
15. a rectangular table
16. a round table
17. a sand dollar
18. butterfly
19. Draw a figure that has:
a. point symmetry
b. line symmetry
c. rotational symmetry
20. A club uses the secret code words below. Describe the types of symmetry, if any, of
each code word.
A
B
C
D
E
F
Prentice Hall Foundations Geometry • Teaching Resources
Copyright © by Pearson Education, Inc., or its affiliates. All Rights Reserved.
36