Symmetry and folding paper
Count symmetric figures with a line of symmetry, draw the mirror image and predict the shape after folding and cutting paper.
- Germany: grade 2
- Iran: grade 3
Guide
A symmetric figure can be folded along a line so that the two halves match exactly. That line is the line of symmetry.
To count a symmetric figure, count one half and double it, as long as nothing lies on the line.
If you fold paper and cut a piece out of the folded edge, the unfolded paper has the cut and its mirror image side by side.