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radius    音标拼音: [r'ediəs]
n. 半径,半径范围;辐,辐射线

半径,半径范围;辐,辐射线

radius
半径

radius
半径

radius
n 1: the length of a line segment between the center and
circumference of a circle or sphere [synonym: {radius}, {r}]
2: a straight line from the center to the perimeter of a circle
(or from the center to the surface of a sphere)
3: a circular region whose area is indicated by the length of
its radius; "they located it within a radius of 2 miles"
4: the outer and slightly shorter of the two bones of the human
forearm
5: support consisting of a radial member of a wheel joining the
hub to the rim [synonym: {spoke}, {wheel spoke}, {radius}]

Radius \Ra"di*us\ (r[=a]"d[i^]*[u^]s), n.; pl. L. {Radii}
(r[=a]"d[i^]*[imac]); E. {Radiuses}
(r[=a]"d[i^]*[u^]s*[e^]z). [L., a staff, rod, spoke of a
wheel, radius, ray. See {Ray} a divergent line.]
1. (Geom.) A right line drawn or extending from the center of
a circle to the periphery; the semidiameter of a circle or
sphere.
[1913 Webster]

2. (Anat.) The preaxial bone of the forearm, or brachium,
corresponding to the tibia of the hind limb. See Illust.
of {Artiodactyla}.
[1913 Webster]

Note: The radius is on the same side of the limb as the
thumb, or pollex, and in man it is so articulated that
its lower end is capable of partial rotation about the
ulna.
[1913 Webster]

3. (Bot.) A ray, or outer floret, of the capitulum of such
plants as the sunflower and the daisy. See {Ray}, 2.
[1913 Webster]

4. pl. (Zool.)
(a) The barbs of a perfect feather.
(b) Radiating organs, or color-markings, of the radiates.
[1913 Webster]

5. The movable limb of a sextant or other angular instrument.
--Knight.
[1913 Webster]

{Radius bar} (Mach.), a bar pivoted at one end, about which
it swings, and having its other end attached to a piece
which it causes to move in a circular arc.

{Radius of curvature}. See under {Curvature}.
[1913 Webster]

143 Moby Thesaurus words for "radius":
O, air line, ambit, amplitude, annular muscle, annulus, approach,
area, areola, asymptote, aureole, axis, beeline, bigness, body,
bore, bottleneck, breadth, bulk, caliber, carry, chaplet, chord,
circle, circuit, circumference, circus, closed circle,
collision course, compass, concentralization, concentration,
concourse, concurrence, confluence, conflux, congress, convergence,
converging, corona, coronet, coverage, crossing, crown, cycle,
depth, diadem, diagonal, diameter, diapason, diffusion, dimension,
dimensions, direct line, directrix, discus, disk, dispersion, edge,
emanation, eternal return, expanse, expansion, extension, extent,
fairy ring, focalization, focus, funnel, gamut, garland, gauge,
girth, glory, great-circle course, greatness, halo, height, hub,
largeness, lasso, length, logical circle, loop, looplet,
magic circle, magnitude, mass, measure, measurement, meeting,
mutual approach, narrowing gap, noose, normal, orbit,
perpendicular, proportion, proportions, purview, radiance,
radiation, radius vector, range, ray, reach, register, right line,
ring, rondelle, round, roundel, saucer, scale, scattering, scope,
secant, segment, semidiameter, shortcut, side, size, spectrum,
sphincter, spoke, spokes, spread, straight, straight course,
straight line, straight stretch, straightaway, streamline, stretch,
sweep, tangent, transversal, vector, vicious circle, volume, wheel,
width, wreath



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  • RADIUS Definition Meaning - Merriam-Webster
    The meaning of RADIUS is a line segment extending from the center of a circle or sphere to the circumference or bounding surface How to use radius in a sentence
  • Radius of a Circle - Formula | What is Radius? | Radius Formula - Cuemath
    The radius of a circle is defined as a line segment that joins the center to the boundary of a circle The distance from the center point to any endpoint on the circle is called the radius of a circle Learn about the radius formulas with solved examples with Cuemath
  • Radius of a circle definition and calculator - Math Open Reference
    The radius of a circle is the length of the line from the center to any point on its edge The plural form is radii (pronounced "ray-dee-eye") In the figure above, drag the orange dot around and see that the radius is always constant at any point on the circle
  • Radius of a Circle - Definition, Formula, Facts, Examples, - SplashLearn
    What Is the Radius of a Circle? The radius of a circle represents the distance between the center and the boundary of the circle (circumference) The radius is generally denoted by “R” or “r ” The word “radius” is the singular form, while “radii” is the plural form
  • Radius of a Circle Calculator
    The radius of a circle calculator returns the length of a circle's radius based on the input data: the circumference, area, or diameter
  • RADIUS | definition in the Cambridge English Dictionary
    RADIUS meaning: 1 (the length of) a straight line joining the centre of a circle to its edge or the centre of a… Learn more
  • Radius Definition (Illustrated Mathematics Dictionary) - Math is Fun
    Illustrated definition of Radius: The distance from the center to the circumference of a circle It is half of the circle's
  • Radius - Math. net
    The radius (plural radii) of a circle is any line segment that has one endpoint on the center of the circle and the other endpoint on the circle's circumference It can also be defined as the distance from the center of a circle to a point on its circumference
  • Radius - definition of radius by The Free Dictionary
    (Mathematics) a straight line joining the centre of a circle or sphere to any point on the circumference or surface 2 (Mathematics) the length of this line, usually denoted by the symbol r 3 (Mathematics) the distance from the centre of a regular polygon to a vertex (long radius) or the perpendicular distance to a side (short radius) 4
  • What is radius of a circle? Definition, Formula, and Examples
    A radius is the distance within a circle from its center to any point in its outer boundary which is called its circumference We can define radius in math and geometry as a line segment that starts in the middle of a circular figure and ends at any point in the shape Note that the radius is not unique to circles or 2-dimensional shapes alone





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