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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