Symmetry
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.
Symmetry in Nature
Although not perfectly symmetrical, when divided in half, you
should notice that there are many similarities between each side
of the leaf above.
The Taj Mahal
Symmetry exists in architecture all around the world. The best known
example of this is the Taj Mahal.
2D Shapes and Symmetry
An equilateral triangle has 3 internal
angles and 3 lines of symmetry.
A square has 4 internal angles and
4 lines of symmetry.
A regular pentagon has 5 internal
angles and 5 lines of symmetry.
A regular octagon has 8 internal angles
and 8 lines of symmetry.
Today’s Activity
Turn your paper LANDSCAPE. Put your
name and class on the top right of your
computer paper. Title the paper
Symmetry. Use a ruler to make a 1 inch
margin around the paper.
Fold the paper in half width-wise.
Using a pencil draw a random design on
the outside of one half of the folded
paper.
You do it!
Refold the paper so that the pencil
drawing is on the inside of the fold.
Rub over the outside of the paper so that
the markings show up on the opposite
side.
Open up the paper and color in the new
symmetrical design. No white area is to
be showing except for the margin.