Question: CG3 Q1 Please help, Explain how a parabola can be defined geometrically. As part of your explanation, explain the idea of a parabola being concave

CG3 Q1

Please help,

Explain how a parabola can be defined geometrically. As part of your explanation, explain the idea of a parabola being concave up or concave down, and how this relates to the relative positions of the focus and directrix of the parabola

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