Khan/khan-exercises — Issue #11027: Parabola intuition 3 - Parabola intuition is too hard
Author: KhanBugz
Created: 2012-01-12 08:33:01+00:00
State: open
Labels: chrome, hard

Reporter: dify.ltd@gmail.com

I found it impossible to find graphically the focus and directrix even after many retries. I had to resort to reverese-engineering the parabola from its roots to get any progress on this exercise.

[parabola_intuition_3.html?seed=80&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/parabola_intuition_3.html?seed=80&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/parabola_intuition_3.html?seed=80&problem=0&debug&activity=%5B%5D)

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Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.2 (KHTML, like Gecko) Ubuntu/11.10 Chromium/15.0.874.106 Chrome/15.0.874.106 Safari/535.2

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