Which of the following are techniques used in geometric constructions with paper folding?

1. Bisecting an Angle: This is a common technique in paper folding where you fold the paper such that one side of the angle lies on top of the other. This creates a crease that bisects the original angle.

2. Constructing Perpendicular Lines: This is done by folding the paper along a line, and then folding it again such that the edge of the first fold lies along the second fold. The crease from the second fold will be perpendicular to the original line.

3. Constructing Parallel Lines: This is done by making a fold to create a line, and then folding the paper again such that the edge of the paper aligns with the crease from the first fold. The crease from the second fold will be parallel to the first.

4. Creating a Right Angle: This is done by folding the paper corner to corner, creating a 45-degree angle. Then, fold the paper again so that the edge of the paper aligns with the crease from the first fold. The resulting angle will be 90 degrees.

5. Constructing an Equilateral Triangle: This is done by folding the paper in half to create a crease. Then, fold one corner of the paper to the crease to create a second crease. The triangle formed by the edge of the paper and the two creases is an equilateral triangle.

6. Dividing a Line Segment into Equal Parts: This is done by folding the paper such that the two ends of the line segment meet. The crease will divide the line segment into two equal parts. This can be repeated to divide the line segment into more equal parts.

7. Constructing a Square: This is done by folding the paper in half horizontally and vertically to create two creases. Then, fold the corners of the paper to the intersection of the creases to create a square.

These are just a few examples of the many geometric constructions that can be done with paper folding.