Triangle
Quadrangle
Pentagon
Quadrangle
Pentagon
To connect vertexes
Making by bisector of corner
Making by perpendicular bisector
Making by foot of perpendicular
Development of the wilderness
To equate areas
To equate angles
Area of triangle
Area of triangle (2)
Angle of corner
To make isosceles triangle
To make square
Theorem of incribed angles
Two middle points theorem
Swing
Swing (2)
Wiper of bus
Trisection machine of corner?
Exploring change
Forming