PreCalculus

Dave Van Leeuwen, Mar 18, 2015


  • 1. Ellipses a different way
  • 2. Constructing limacon and cardiod.
  • 3. General quadratic parabola

1.

Ellipses a different way

Every ellipse can be constructed by rotating two points on concentric circles at the same rotational speed in opposite directions, and tracing the midpoint of the segment between them. This sketch shows the process for horizontal and vertical ellipses.

I limited slider values only for convenience.
– Dave Van Leeuwen

2.

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3.

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