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radius
In classical geometry, the radius of a circle or sphere is the length of a line segment from its center to its perimeter. The name comes from 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 mathematic variable name for "radius" is r. By extension, the diameter d is defined as twice the radius:
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 }}.}
Alternatively, this can be expressed as
r
=
C
τ
.
{\displaystyle r={\frac {C}{\tau }}.}
, with
τ
{\displaystyle {\tau }}
(tau) being equal to
2
π
{\displaystyle 2{\pi }}
exactly, although this has yet to gain mainstream usage.
Hello,
I am currently looking to sell my Silencerco Radius 1000 Rangefinder. Brand new in the box they are selling for around $750 on Ebay. Used I have found them as low as $550. I am currently looking to let mine go for $400 used as we are a bit strapped for cash this month. I am happy to meet...
Good afternoon everyone,
I am currently looking to sell my Silencerco Radius 1000, 1mile rangefinder. I really do not want to get rid of it, however we are in a bit of a bind for cash this month. I know new in the package they are selling for around $800 on ebay. I have found used ones for as...
For sale is a SilencerCo Weapons Research Radius Range Finder. I am asking $750 which is about 25% under MSRP. I prefer FTF meetings but may be willing to ship and accept PayPal from established users.
Features:
General Range: 20 Yards–1,760 Yards (At Dusk/Dawn on Reflective Target)
Maximum...