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Third symmetry
For this activity you will need a square sheet of paper 30 x 30 cm.

Fold your paper in half.





Now fold in half again, this time in reverse, if the first bend did to the left or right, the second should make upward or downward.



With the folds you did get a smaller square.

Now comes the more difficult fold, are you ready? Fold your square on the diagonal, as shown in the drawing

In the triangle is you draw a picture that does not touch the tips of the triangle.

Cut the drawing you did and get a picture with symmetry rotation.

The figure was you is said to have rotational symmetry because if the tour or broken, well, you get the same picture you had in the beginning.

Using the rotational symmetry we can perform the famous chopped papers used in the altars of day dead, only in the altars, which hangs is not the figure itself but the square with the gap left by drawing the trim.

For example, we make the necessary bends in our square of tissue paper and mark the triangle figures

cut out the figures and outcomes:

And so is
Forward already have several techniques to make new designs, combine them and have fun with math!