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Symmetry: A Visual Presentation

Symmetry: A Visual Presentation. A PowerPoint Presentation created by Mrs. Gamache using the collection of web pages created by the Adrian Bruce and students of 6B http://www.adrianbruce.com Geometry, Unit 8, Day 6. Line Symmetry.

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Symmetry: A Visual Presentation

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  1. Symmetry:A Visual Presentation A PowerPoint Presentation created by Mrs. Gamache using the collection of web pages created by the Adrian Bruce and students of 6B http://www.adrianbruce.com Geometry, Unit 8, Day 6

  2. Line Symmetry • Shape has line symmetry when one halfof it is the mirror image of the other half. • Symmetry exists all around us.

  3. Is a butterfly symmetrical?

  4. At the  beach there are a variety of shells with line symmetry.

  5. Under the sea there are also many symmetrical objects such as these crabsand this starfish.

  6. Animals that have Line Symmetry Here are a few more great examples of mirror image in the animal kingdom.

  7. THESE MASKS HAVE SYMMETRY These masks have a line of symmetry from the forehead to the chin. The human face also has a line of symmetry in the same place.

  8. REFLECTION IN WATER If an object is reflected in water it is considered to have line symmetry along the waterline.

  9. The Taj Mahal Symmetry exists in architecture all around the world.  The best known example of this is the Taj Mahal.

  10. This photograph shows 2 lines of symmetry. One vertical, the other along the waterline. (Notice how the prayer towers, called minarets, are reflected in the water and side to side).

  11. an equilateral triangle has 3 lines of symmetry. 

  12.   a square has 4 lines of symmetry. 

  13.   a regular pentagon has 5 lines of symmetry.

  14. a regular hexagon has 6 lines of symmetry .

  15.   a regular octagon has 8 lines of symmetry.

  16. The Alphabet • In the alphabet, what capital letters have vertical symmetry? Horizontal symmetry? Both? • Vertical: AHIMOTUVWXY • Horizontal: BCDEHIKOX • Both: HIOX

  17. 180° Definition • Rotational symmetry any figure that can rotate 180° or less that maps the figure onto itself. • Example:

  18. State which objects have rotational symmetry 60 60 60

  19. Work Together! • With a partner, find examples of symmetrical objects in the classroom. For each object that you find, sketch it and list its symmetries. This is timed. • Points: • Reflectional Symmetry = 1 point • Rotational Symmetry of 180° = 2 points • Rotational Symmetry other than 180° = 3 points

  20. Homework Work Packet: Symmetry

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