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Main Idea/Vocabulary

Identify line symmetry and rotational symmetry. line symmetry. line of symmetry rotational symmetry angle of rotation. Main Idea/Vocabulary. Identify Line Symmetry. Determine whether the figure has line symmetry. If it does, draw all lines of symmetry. If not, write none.

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Main Idea/Vocabulary

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  1. Identify line symmetry and rotational symmetry. • line symmetry • line of symmetry • rotational symmetry • angle of rotation Main Idea/Vocabulary

  2. Identify Line Symmetry Determine whether the figure has line symmetry. If it does, draw all lines of symmetry. If not, write none. Answer: This figure has one vertical line of symmetry. Example 1

  3. A B C D BOTANY Determine whether the leaf has line symmetry. If it does, draw all lines of symmetry. If not, write none. A. none B. 1 line C. 2 lines D. 3 lines Example 1

  4. Identify Rotational Symmetry FLOWERSDetermine whether the flower design has rotational symmetry. Write yes or no. If yes, name its angle(s) of rotation. Example 2

  5. Identify Rotational Symmetry Answer: Yes, this figure has rotational symmetry. It will match itself after being rotated 90, 180, and 270. Example 2

  6. A B C D FLOWERSDetermine whether the flower design has rotational symmetry. Write yes or no. If yes, name its angle(s) of rotation. A. yes, 90° B. yes, 120° C. yes, 180° D. no Example 2

  7. Use a Rotation ARCHITECTUREA rosette is a painted or sculptured ornament, usually circular, having designs that radiate symmetrically from the center. Copy and complete the picture of the rosette shown so that the completed figure has rotational symmetry with 90, 180, and 270 as its angles of rotation. Example 3

  8. 90° counterclockwise 180° counterclockwise 90° clockwise Use a Rotation Use the procedure described above and the points indicated to rotate the figure 90, 180, and 270 counterclockwise. Use a 90 rotation clockwise to produce the same rotation as a 270 rotation counterclockwise. Answer: Example 3

  9. A B C D A.B. C.D. DESIGNCopy and complete the figure so that the completed design has rotational symmetry with 90, 180, and 270 as its angles of rotation. Example 3

  10. A B C A. yes; A  X, B  Z, C  Y, AB  XY, BC  YZ, AC  XZ, ΔABC  ΔXYZ B.yes; A  X, B  Y, C  Z, AB  XY, BC  YZ, AC  XZ, ΔABC  ΔXYZ C.no (over Lesson 6-4) Determine whether the polygons are congruent.If so, list their congruent parts. Five Minute Check 1

  11. A B C A. B. C.no (over Lesson 6-4) Determine whether the polygons are congruent. If so, list their congruent parts. Five Minute Check 2

  12. A B C D (over Lesson 6-4) In the figure, ΔCLS  ΔFIJ. Find mI. A. 30° B. 45° C. 60° D. 75° Five Minute Check 3

  13. A B C D A. B. C. D. (over Lesson 6-4) If ΔABC  ΔXYZ, which of the following options is not true? Five Minute Check 4

  14. End of Custom Shows

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