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A detailed tutorial on how to find the directrix of a parabola. Step by step tutorial including several examples of how to find the directrix of a parabola for reference.

A parabola is a curved shape that is formed by the graph of the function x squared. A parabola is technically known as the locus of points where the distance to the focus equals the distance to the directrix. The directrix is a given line on a parabola that does not go through the focus.

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A detailed tutorial of the definition of a cissoid. Step by step tutorial including a visual example of the definition of a cissoid for reference.

A cissoid is a curve that  is found from two curves and a point. The point is known as “the pole”. Each definition of a cissoid and instructions on how to find the cissoid are a little different, depending on your source. However, the basic definition of a cissoid is that it is an average point that is relative to the pole and found between the two given curves. Keep in mind that the cissoid is a curve, not a point, but the curve is to be drawn from the point that is found.