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Mathematics 16 Online
OpenStudy (anonymous):

A parabola has its vertex at the origin and a directrix at y=4. Where is the focus located?

jimthompson5910 (jim_thompson5910):

blank xy axis |dw:1437436785171:dw|

jimthompson5910 (jim_thompson5910):

|dw:1437436834898:dw|

jimthompson5910 (jim_thompson5910):

draw in the directrix y = 4 |dw:1437436852839:dw|

jimthompson5910 (jim_thompson5910):

`A parabola has its vertex at the origin` |dw:1437436941427:dw|

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