D12. The sliding reflectional symmetry
Friezes with sliding
A sliding reflectional symmetry has a reflection line and a sliding vector in the same direction. In the friezes the sliding vector is half of the translational vector. There are many and all of them are multiple of a non-null vector.
1st. Activate the "Move" tool 
. Move the points so that the reflection line and the sliding vector make the black frieze matches with its grey colour transformation. You must find the smallest vector different from zero.
The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.
If the activity is correct, you will get 10 points automatically.
. Move the points so that the reflection line and the sliding vector make the black frieze matches with its grey colour transformation. You must find the smallest vector different from zero.
The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.
If the activity is correct, you will get 10 points automatically.