## Most recent change of Spiral

Edit made on November 22, 2008 by DerekCouzens at 21:15:30

Deleted text in red / Inserted text in green

WW
A spiral is a curve which starts at a central point and gets progressively further and further away.
[[[> IMG:Picture3.png ]]]
The Spiral is a plane curve which starts at a central point and gets progressively further and further away.

Spirals can be found in nature:

* Arrangement of seeds in sunflowers etc.
* Shells of nautilus and other animals

There are many named spirals which include:

* Archimedes' (or equiangular) spiral has the formula EQN:r=a\theta in polar coordinates
* Logrithmic spiral has the formula EQN:r=ab^\theta in polar coordinates

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One of the Named Curves on this site.