Photo: Sam Derbyshire, Envelope of curves
http://en.wikipedia.org/wiki/File:EnvelopeAnim.gif

Parabola as envelope of straight lines/Parabola come inviluppo di rette (applet):
http://www.gobnf.com/formule/default.aspx?code=0010534LKBP1
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Formule by BNF
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Sam Derbyshire, Envelope of curves
http://en.wikipedia.org/wiki/File:EnvelopeAnim.gif

Parabola as envelope of straight lines/Parabola come inviluppo di rette (applet):
http://www.gobnf.com/formule/default.aspx?code=0010534LKBP1

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