http://www.dpgraph.com/math-art-contributors.html

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=b4LqzPhHFlhqUM&tbnid=_DkpBRIj5aEjvM:&ved=0CAUQjRw&url=http://www.arthursclipart.org/sciencetechnology/page_01.htm&ei=T_o3Ua3QNony0wGV0IHgBA&bvm=bv.43287494,d.dmQ&psig=AFQjCNHsJU1grmXgOiwoVg_JXNa5qtV69A&ust=1362709352676014

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=b4LqzPhHFlhqUM&tbnid=_DkpBRIj5aEjvM:&ved=0CAUQjRw&url=http://hotmath.com/hotmath_help/topics/conic-sections-and-standard-forms-of-equations.html&ei=8vk3UaOsOau50AHc9YGIDw&bvm=bv.43287494,d.dmQ&psig=AFQjCNHsJU1grmXgOiwoVg_JXNa5qtV69A&ust=1362709352676014

http://blog.industrysoftware.automation.siemens.com/blog/2011/08/24/conics-geometric-constraint-solving/conic_sections_www_text/

http://rowdy.mscd.edu/~talmanl/HTML/ParabolaDF.html

http://www.mathsisfun.com/geometry/conic-sections.html

http://www.falstad.com/ripple/ex-parabola.html

http://www.maplesoft.com/applications/view.aspx?SID=5523&view=html

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=TDwbWUuUENoNKM&tbnid=WmsGUldr4SfrdM:&ved=0CAUQjRw&url=http://www.mathwarehouse.com/geometry/parabola/standard-and-vertex-form.php&ei=VwM4UZG6LIHo0gHcioHYAQ&bvm=bv.43287494,d.dmQ&psig=AFQjCNFSejJYDrucXqFt0uNCVQDG6fsUnA&ust=1362711716840567

p

p y =-p

(0,p)x2 =4py , p>0

focus

directrix

y =-p

(0,p)x2 =4py , p<0focus

directrix

x =-p

(p,0)

y2 =4px , p>0

focus

directrix

x =-p(p,0)

y2 =4px , p<0

focus

directrix

Standard Equation of a Parabola

(x- h)2 = 4p(y – k)

(y- k)2 = 4p(x – h)

Vertical axis, directrix: y = k-p

Horizontal axis, directrix: x = h-p