RADII - translation to arabic
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RADII - translation to arabic

SEGMENT IN A CIRCLE OR SPHERE FROM ITS CENTER TO ITS PERIMETER OR SURFACE AND ITS LENGTH
Radii; Radius (geometry); Curve radii
  • center or origin ''O''}}
  • A square, for example (''n''=4)

RADII         

ألاسم

نِصْفُ قُطْر

radii         
‎ أَنْصافُ الأَقْطار,أَشِعَّة, كَعابِر‎
radii         

pl of radius أنصاف ، أقطار

Definition

radii
Radii is the plural of radius
.

Wikipedia

Radius

In classical geometry, a radius (PL: radii) of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the latin radius, meaning ray but also the spoke of a chariot wheel. The plural of radius can be either radii (from the Latin plural) or the conventional English plural radiuses. The typical abbreviation and mathematical variable name for radius is R or r. By extension, the diameter D is defined as twice the radius:

d 2 r r = d 2 . {\displaystyle d\doteq 2r\quad \Rightarrow \quad r={\frac {d}{2}}.}

If an object does not have a center, the term may refer to its circumradius, the radius of its circumscribed circle or circumscribed sphere. In either case, the radius may be more than half the diameter, which is usually defined as the maximum distance between any two points of the figure. The inradius of a geometric figure is usually the radius of the largest circle or sphere contained in it. The inner radius of a ring, tube or other hollow object is the radius of its cavity.

For regular polygons, the radius is the same as its circumradius. The inradius of a regular polygon is also called apothem. In graph theory, the radius of a graph is the minimum over all vertices u of the maximum distance from u to any other vertex of the graph.

The radius of the circle with perimeter (circumference) C is

r = C 2 π {\displaystyle r={\frac {C}{2\pi }}}
Examples of use of RADII
1. The team now has convincing data for the planet orbiting very close to the star, at a distance of about 10 stellar radii.