RADIUS Meaning and
Definition
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Radius is a noun that refers to the distance between the center of a circle or a sphere and any point on its boundary. It is commonly denoted by the letter "r." In geometry, the radius plays a vital role in various measurements and calculations related to circles, such as the circumference, area, and diameter. Typically, the radius extends from the center of the circle to its outermost point, which is also known as the circumference.
The concept of radius is applicable to three-dimensional shapes as well, like spheres. In this context, the radius represents the distance from the center of the sphere to any point on its surface. It provides a fundamental attribute of spheres, allowing for the determination of volume, surface area, and other calculations.
Furthermore, the term "radius" is not limited to mathematical or geometrical contexts. It can also be used metaphorically to describe the extent or reach of something. For instance, in a social or cultural context, we might refer to the "radius of influence" to express the scope or impact someone has on their surroundings. Similarly, in scientific fields, such as physics or chemistry, the term "atomic radius" defines the size or extent of an atom. Overall, the concept of radius finds diverse applications in various disciplines, capturing the fundamental idea of distance or extent from a central point.
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1. A straight line passing from the center to the periphery of a circle. 2. The outer and shorter of the two bones of the forearm.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
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Etymology of RADIUS
The word "radius" originated from Latin and can be traced back to the ancient Greek word "rhoádon", meaning "rod" or "wand". This Greek term was used to describe the spoke of a wheel, a staff, or a beam. In Latin, "radius" took on multiple meanings, including "ray of light" and "spoke of a wheel". Over time, its usage narrowed down to primarily refer to the bone in the forearm (which is straight like a rod) and subsequently to any line segment extending from the center of a circle to its circumference.
Similar spelling words for RADIUS
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