Types of symmetry
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The document introduces the concept of symmetry, focusing on reflection symmetry and point symmetry. Reflection symmetry involves shapes being mirror images along a line, while point symmetry relates to parts being equidistant from a central point in opposite directions. The document provides examples and encourages readers to engage with their understanding of symmetries.
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Types of symmetry
- 1. SYMMETRY Today we are going to learn about symmetry. There are many types of it, but we will take an interest in: reflection symmetry, and point symmetry
- 3. Culture Beyond Borders International Geometry Gimnazjum 17 in Wrocław March 2015
- 4. Reflection Symmetry - the simplest kind of symmetry, sometimes called Line Symmetry or Mirror Symmetry. It is easy to see, because one half is the reflection of the other half.
- 5. EXAMPLES
- 6. A shape has line symmetry if… You can draw a line through it so that one part is exactly the same as the other part.
- 9. Now guess: How many lines of symmetry has a square got?
- 10. Watch! A square has 4 lines of symmetry
- 11. How many lines of symmetry does this shape have? 0 1 2 More than 2
- 12. Watch! This shape has 1 line of symmetry
- 13. But how many lines of symmetry does this shape have? 0 1 2 More than 2
- 14. Watch! This shape has 2 lines of symmetry
- 15. We can say • 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. The fold is called a line of symmetry.
- 16. POINT SYMMETRY Point Symmetry is when every part has a matching part: the same distance from the central point but in the opposite direction.
- 17. EXAMPLE
- 18. and some more…
- 19. So, if you know everything about symmetries, start working !