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Line symmetry
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
2. Line Symmetry
Shape has line symmetry when one half
of it is the mirror image of the other half.
Symmetry exists all around us and many
people see it as being a thing of
beauty.
5. At the beach there are
a variety of shells with line
symmetry.
6. Under the sea there are also
many symmetrical objects
such as these crabs
and this starfish.
7. Animals that have Line
Symmetry
Here are a few more great examples of
mirror image in the animal kingdom.
8. 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.
9. Human Symmetry
The 'Proportions of Man'
is a famous work of art
by Leonardo da Vinci
that shows the symmetry
of the human form.
10. REFLECTION IN WATER
If an object is
reflected in water it
is considered to
have line symmetry
along the waterline.
11. The Taj Mahal
Symmetry exists in architecture all around
the world. The best known example of this
is the Taj Mahal.
12. 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).
13. 2D Shapes and Symmetry
After investigating the following
shapes by cutting and folding,
we found:
18.
a regular octagon has 8 internal angles
and 8 lines of symmetry.
Notes de l'éditeur
How would you define the term 'line symmetry'? Why might some people see line symmetry as a thing of beauty?
This type of symmetry is also called reflectional symmetry as the two parts reflect/match along each side of a dividing line ( or axis ).
There are also many examples of symmetry inside the human body e.g. the lungs, the kidneys, the brain, the skull, etc.
In this view of the building there is a line of symmetry through the centre of the tomb from top to bottom. It was completed in 1630 by the Indian ruler Shahs Jahan as a tomb for his favourite wife Mumtaz Mahal who died as a result of giving birth to their 14th child. To build this tomb it took 20 000 workers, 20 years (Encarta 97) and it is rumoured that they used 40 000 elephants to transport the materials.
Is there a pattern here? How could you prove that a square really does have 4 lines of symmetry and not 2. A rectangle has 4 lines of symmetry. True or False? How could you prove it? What pattern can you see emerging on this page?
