Can anyone please tell me how to prove this ellipse is the locus of points for which the distance from a point (focus) is proportional to the distance from the directrix from the following picture ?
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1See this: https://math.stackexchange.com/a/137462/255730 – Intelligenti pauca Mar 07 '21 at 11:56
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1@sani Also see this https://math.stackexchange.com/questions/2047706/reconciliation-of-cone-slicing-and-focus-directrix-definitions-of-conic-sections/2058073#2058073 – cosmo5 Mar 12 '21 at 14:01
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Thank you for sharing the links – anonymous Mar 14 '21 at 07:40