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http://www.dpgraph.com/math-art-contributors.html. http://rowdy.mscd.edu/~talmanl/HTML/ParabolaDF.html. http://www.mathsisfun.com/geometry/conic-sections.html. http://www.maplesoft.com/applications/view.aspx?SID=5523&view=html. http://www.falstad.com/ripple/ex-parabola.html. x 2 =4py , p>0.
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http://www.mathsisfun.com/geometry/conic-sections.html http://www.maplesoft.com/applications/view.aspx?SID=5523&view=html http://www.falstad.com/ripple/ex-parabola.html
x2 =4py , p>0 (0,p) p focus p y =-p directrix
y =-p directrix (0,p) x2 =4py , p<0 focus
(p,0) focus directrix x =-p y2 =4px , p>0
x =-p (p,0) focus directrix y2 =4px , p<0
Standard Equation of a Parabola (x- h)2 = 4p(y – k) Vertical axis, directrix: y = k-p (y- k)2 = 4p(x – h) Horizontal axis, directrix: x = h-p