6th Grade Ch. 1 Sec. 2 Symmetry

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6th Grade Ch. 1 Sec. 2 Symmetry

  1. 1. Ch. 1 Sec. 2 Symmetry
  2. 2. Radial Symmetry <ul><li>1 line of symmetry </li></ul><ul><li>halves that are mirror images </li></ul><ul><li>front end w/ sense </li></ul><ul><li>organs </li></ul><ul><li>quick movement </li></ul>Bilateral Symmetry <ul><li>many lines of </li></ul><ul><li>symmetry </li></ul><ul><li>no distinct front end </li></ul><ul><li>live in water </li></ul><ul><li>move slowly </li></ul><ul><li>balanced arrangement of parts </li></ul>Types of symmetry
  3. 4. asymmetry <ul><ul><ul><ul><ul><li>NO symmetry </li></ul></ul></ul></ul></ul>sponges
  4. 5. radial symmetry <ul><li>many lines of symmetry that all go thru. central point </li></ul>
  5. 7. animals with radial symmetry sea urchin sea star brittle star sand dollar
  6. 8. SEA ANEMONE
  7. 9. Clownfish hide in the poisonous tentacles of the sea anemone.
  8. 10. bilateral symmetry <ul><li>1 line that divides it into halves that are mirror images </li></ul>
  9. 12. A shape has bilateral symmetry when one half of it is the mirror image of the other half .
  10. 13. Animals that have bilateral symmetry
  11. 14. Symmetry of the Human Face <ul><li>No face has perfect mathematical symmetry! </li></ul><ul><li>But plastic surgeons study facial symmetry to help them reconstruct faces. </li></ul><ul><li>It is thought that as a face gets closer to symmetrical more people think it is beautiful. </li></ul>
  12. 15. Is the Face Really Symmetrical? <ul><li>Notice that the photos of each child's face is made up of the original photo, 2 left sides and 2 right sides. </li></ul><ul><li>right / right left / left original photo </li></ul>
  13. 16. right/right left/left original photo
  14. 17. <ul><li>right/ right left/left original photo </li></ul>
  15. 18. <ul><li>right/ right left/left original photo </li></ul>
  16. 19. The Symmetry of Capital Letters <ul><li>some have one line of symmetry </li></ul><ul><li>some have two lines of symmetry </li></ul><ul><li>some have no lines of symmetry               </li></ul><ul><li>                                      </li></ul>
  17. 20. Bilateral Symmetry demonstrations
  18. 21. Types of Animals
  19. 22. Name that symmetry
  20. 23. radial symmetry
  21. 24. radial symmetry <ul><li>many lines of symmetry that all go thru. central point </li></ul>
  22. 25. bilateral symmetry
  23. 26. no symmetry (asymmetry)
  24. 27. radial symmetry <ul><li>all live in water </li></ul>
  25. 28. radial symmetry <ul><li>do not have distinct front or back ends </li></ul>
  26. 29. radial symmetry <ul><li>most do not move fast </li></ul>
  27. 30. radial symmetry
  28. 31. bilateral symmetry <ul><li>1 line that divides it into halves that are mirror images </li></ul>
  29. 32. bilateral symmetry <ul><li>distinct front ends (sense organs) </li></ul>
  30. 33. Mark the line of symmetry
  31. 34. Activity- Magazine pics

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