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[[[> 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 ---- One of the Named Curves on this site.