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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 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, Formulas, Examples
    The radius of a circle is the distance from the center of the circle to any point on its circumference It is half the length of the diameter of the circle Shown below is the radius of the circle As we know, diameter is twice the radius of a circle, or in words radius is half of the diameter
  • Radius of a Circle - Definition, Formula, Facts, Examples,
    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 ”
  • Radius of a Circle Calculator
    By definition, a circle is a 2-dimensional shape consisting of all the points lying at the same, fixed distance from a given point That distance is known as the radius of the circle Now that we know what the radius of a circle is (marked with green), let's get familiar with the rest of the lines
  • Radius of a circle definition and calculator - Math Open Reference
    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 Sometimes the word 'radius' is used to refer to the line itself In that sense you may see "draw a radius of the circle"
  • RADIUS | definition in the Cambridge English Dictionary
    The supermarket, shopping mall, and school are all within a one-mile radius of the house (= are all less than a mile away from it)
  • Radius of Circle - GeeksforGeeks
    The radius of a circle is the distance from the center of the circle to any point on its circumference It is a constant length for a given circle and is half the diameter of the circle
  • 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
  • How to Calculate the Radius of a Circle: Formulas More - wikiHow
    The radius of a circle is the distance from the center of the circle to any point on its circumference The easiest way to find the radius is by dividing the diameter in half





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