A special arch-shaped curve that follows this rule:

For any point, the distances:

• from that point to a fixed point (the focus), and

• from that point to a fixed straight line (the directrix)

are always in the same ratio.

It is one of the "Conic Sections"

For any point, the distances:

• from that point to a fixed point (the focus), and

• from that point to a fixed straight line (the directrix)

are always in the same ratio.

It is one of the "Conic Sections"

See: Conic Section

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