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5.1 By paper folding

Draw a straight line on a piece of paper, and a point somewhere not on the line. Then fold the paper over so that the point touches the line and crease the fold. Do this several times. The envelope formed by the creases will make a nice parabola.

You can make an ellipse or hyperbola similarly by using a circle and a point.

6 External links

Conic sections

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Parabola Line Point Focus Axis Directrix Linea Symmetry Vertex

Topics: Parabola Line Point Focus Axis Directrix Linea Symmetry Vertex...

ParabolaA parabola is a conic section generated by the intersection of a cone, and a plane tangent to the cone or parallel to some plane tangent to the cone. If the plane is itself tangent to the cone, one would obtain a degenerate parabola, a line. A parabola ca  


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