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Khan Academy: Algebra: Conic Sections: Focus and Directrix of a Parabola 2 Instructional Video for 9th - 10th Grade | Lesson Planet
Conic Sections | summer, Coney Island | Where do circles, ellipses, hyperbolas, and parabolas like to hang out in the summer? Coney Island! You can make many different shapes by pointing a...
Andy Matuschak on X: "Impressive interactive map of Khan Academy's math curriculum shows emergent topic structure: http://t.co/kQX5M9At93 http://t.co/64m30t9xsz" / X
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