Line symmetry

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Line symmetry

  1. 1. Line Symmetry
  2. 2. Line Symmetry <ul><li>If a shape can be folded in half so that one half fits exactly on top of the other, then we say that the shape has got line symmetry . </li></ul><ul><li>The fold is called a line of symmetry. </li></ul><ul><li>This shape has got a vertical line of symmetry. </li></ul>
  3. 3. Line Symmetry in the Alphabet <ul><li>Which letters have got lines of symmetry? </li></ul>A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Click to see the lines of symmetry.
  4. 4. Lines of Symmetry all around us <ul><li>Which of these road signs have got lines of symmetry? </li></ul>Click to see the lines of symmetry.
  5. 5. Line Symmetry with Pentominoes <ul><li>If you don’t know what a pentomino is, then click here. </li></ul><ul><li>If you have done the pentominoes activity before, then you will know what a pentomino is and how many different pentominoes there are. </li></ul><ul><li>Here they are ... </li></ul>
  6. 6. Line Symmetry with Pentominoes <ul><li>How many lines of symmetry does each Pentomino have? </li></ul><ul><li>Sort them according to their lines of symmetry. </li></ul>
  7. 7. Line Symmetry with Pentominoes One Line of Symmetry Two Lines of Symmetry Four Lines of Symmetry Click to start sorting
  8. 8. Line Symmetry with 7-Pin Polygons <ul><li>If you don’t know what a 7-pin polygon is, then click here. </li></ul><ul><li>If you have done the 7-pin polygons activity before, then you will know what a 7-pin polygon is and how many different ones there are. </li></ul><ul><li>Here they are ... </li></ul>
  9. 9. Line Symmetry with 7-Pin Polygons <ul><li>How many lines of symmetry does each 7-Pin Polygon have? </li></ul><ul><li>Sort them according to their lines of symmetry. </li></ul>
  10. 10. Line Symmetry with 7-Pin Polygons One Line of Symmetry Two Lines of Symmetry Six Lines of Symmetry Three Lines of Symmetry Click to start sorting
  11. 11. Now you know all about line symmetry! END OF PRESENTATION
  12. 12. Pentominoes <ul><li>A pentomino is made out of five squares that are connected along at least one edge. </li></ul>These are NOT pentominoes. Here is an example of a pentomino. How many different pentominoes can you find? Click here to return to line symmetry.
  13. 13. 7-Pin Polygons <ul><li>Here is an arrangement of 7 pins. </li></ul>Here are some examples of 7-pin polygons. How many different 7-pin polygons can you find? Click here to return to line symmetry. A 7-pin polygon is a closed shape with straight sides with corners on the pins.
  14. 14. END OF PRESENTATION

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