In mathematics, a spiral is a curve which emanates from a point, moving further away as it revolves around the point. [1][2][3][4] It is a subtype of whorled patterns, a broad group that also includes concentric objects. Spirals generated by 6 mathematical relationships between radius and …

spiral, plane curve that, in general, winds around a point while moving ever farther from the point. Many kinds of spirals are known, the first dating from the days of ancient Greece. The curves are observed in nature, and human beings have used them in machines and in ornament, notably architectural—for example, the whorl in an Ionic capital.

2021年6月23日 · Of all the natural shapes, spirals are considered one of the most common in nature. We find spirals from giant galaxies down to the smallest gastropod shells.

This list of spirals includes named spirals that have been described mathematically.

2015年3月19日 · Spirals are a common shape found in nature, as well as in sacred architecture. In the natural world, we find spirals in the DNA double helix, sunflowers, the path of draining water, weather patterns (including hurricanes), vine tendrils, phyllotaxis (the arrangement of leaves on a plant stem), galaxies, the horns of various animals, mollusc ...

spiral (from sth) to sth The country's foreign debt spiralled from $840 million to $2.6 billion. Stock prices have spiralled downwards for the past two weeks. The project spiraled out of control, …

2019年4月25日 · Snail shells, flower petals, pine cones, snakes, storms, DNA, curly hair, even galaxies are spirals—and that’s not even nearly all! Why are spirals so abundant in nature? No one can say for certain, but a possible answer is, because spirals are the smart way to grow!

Cutaway of a nautilus shell showing the chambers arranged in an approximately logarithmic spiral. A spiral is a special curve in mathematics. This curve starts at a point, and then goes around the point, but gets farther and farther away from it. This is different from a circle (which is always at the same distance) or an ellipse.

Let’s test to see how many spiral-shaped objects you can find around you right now. I bet there are more than you think. A spiral may be hidden in the flower petals of your houseplants. One might be staring at you from that seashell you brought home from your last trip to the beach.

4 天之前 · A spiral is a curve that gets farther away from a central point as the angle is increased, thus "wrapping around" itself. The simplest example is Archimedes' spiral, whose radial distance increases linearly with angle. A number of named cases are illustrated above and summarized in the following table.