spring-of-mathematics: Type of Spirals: A spiral is a curve in the plane or in the space, which runs around a centre in a special way. Different spirals follow. Most of them are produced by formulas:The radius r(t) and the angle t are proportional for the simplest spiral, the spiral of Archimedes. Therefore the equation is: (3) Polar equation:... - http://blog.gpessia.net/post...