Videos
About Y = a
80
Summary video 01
130
Hurdle 1
232
About Y = 0
66
Hurdle 2
103
Hurdle 3
78
Hurdle 4
95
About X = a
65
About X = 0 video 01
74
About X = 0 video 02
82
About Origin
160
Symmetry Points
66
Symmetry in Regular Polygons
200
The Wall Painting
163
How Many Times?
162
Angle of Symmetry
188