About Lesson
To find the following basic geometrical facts by paper folding :
1. The mid-point of a line-segment.
2. The perpendicular bisector of a line-segment.
3. The bisector of an angle.
4. The perpendicular to a line from a point given outside it.
5. The perpendicular to a line at a point given on the line.
6. The medians of a triangle.
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