A powerpoint presentation made for an international geometry lesson during a Comenius visit in Gimnazjum 17 in Wrocław within the project 'Culture Beyond Borders'

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.

7. Watch these shapes

8. Now watch these

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 ! 