Question 21
Today Bi learns paper folding and cutting. His teacher gives him a square sheet, folds it in half twice into a smaller square as shown, then punches one circular hole through the folded packet. Dashed lines are folds.
1. Relate these folds to the opening problem of Topic 5: Symmetry. Which pictured shape appears after opening the paper once?
2. Does that shape have an axis of symmetry? If so, identify it and compare its position with the fold.
3. When Bi opens the paper a second time, where is the next fold? It is shown by a red dashed line in the choices; holes are omitted in those pictures.
4. Which pictured result appears after all folds are opened?
1. Relate these folds to the opening problem of Topic 5: Symmetry. Which pictured shape appears after opening the paper once?
2. Does that shape have an axis of symmetry? If so, identify it and compare its position with the fold.
3. When Bi opens the paper a second time, where is the next fold? It is shown by a red dashed line in the choices; holes are omitted in those pictures.
4. Which pictured result appears after all folds are opened?