[size=200][b]The translational symmetry of the friezes[/b][/size][br][br][color=#000000]A translational symmetry makes an object match with its transformation. The friezes are formed by many repeated images and have many translational vectors, but all of them are multiple of a non-null vector.[/color][br][br][color=#9900ff]1st. Activate the "Move" tool [icon]/images/ggb/toolbar/mode_move.png[/icon] and drag the points until the frieze and its image match. You must find the smallest non-null vector.[/color][br][br][color=#000000]The two curved arrows located in the upper right corner of the Graphics View allow you to reset the activity.[/color][br][color=#000000]If the activity is correct, you will get 10 points automatically.[/color]