Gebruiker:Martinvl/Fibonaccireeks: Verskil tussen weergawes
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Lyn 84:
====Voorbeeld====
As iemand met 'n ''archimedean spiral'' <math>\;r(\theta)=a\theta\;</math> kry hy 'n koniese spiraal
|url = https://mathcurve.com/courbes3d.gb/spiraleconic/pappus.shtml
|title = Conical spiral of Pappus
|first = Robert
|last = Ferréol
|publisher = mathcurve.com
|year = 2018
|language = English}}</ref> (sien beeld regs):
:<math>x=a\theta\cos\theta \ ,\qquad y=a\theta\sin\theta\ , \qquad z=z_0 + ma\theta \ ,\quad \theta \ge 0 \ .</math>
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