Matthew Arcus (@matthewarcus) 's Twitter Profile
Matthew Arcus

@matthewarcus

ID: 494235505

calendar_today16-02-2012 17:35:35

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Matthew Arcus (@matthewarcus) 's Twitter Profile Photo
Matthew Arcus
@matthewarcus

2 years ago

Apollonius of Perga, around 300 BC, wrote a brilliant series of books on conic sections, which, perhaps strangely, did not use the focus-directrix construction. This is his basic construction for an ellipse, equivalent to the equation y² = x-kx² (geogebra.org/geometry/yk4r3…):

Apollonius of Perga, around 300 BC, wrote a brilliant series of books on conic sections, which, perhaps strangely, did not use the focus-directrix construction. This is his basic construction for an ellipse, equivalent to the equation y² = x-kx² (geogebra.org/geometry/yk4r3…):