Parabola as an envelope of straight lines
Description
A straight line m and a point A are given. Let B be an arbitrary point in the line m.
The parabola is defined as the envelope of the perpendicular bisectors to AB.
Things to try:
- Drag points A and B.
- Drag the slider to move B.
- To show the trace of the perpendicular bisector to AB, activate the box Trace.