名詞 radius:

1. the length of a line segment between the center and circumference of a circle or sphere
   同義詞：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)
   同義詞：radius
3. a circular region whose area is indicated by the length of its radius
   同義詞：radius
4. the outer and slightly shorter of the two bones of the human forearm
   同義詞：radius
5. support consisting of a radial member of a wheel joining the hub to the rim
   同義詞：spoke, wheel spoke, radius

1. An early instrument for measuring altitude of celestial bodies, consisting of a90= graduated arc with a movable radius for measuring angles.
   象限儀用來測量天體緯度的一種早期工具，由一個(gè)有90度刻度的圓弧和一個(gè)用來測量角度的可移動的半徑構(gòu)成
2. Moving or directed along a radius.
   沿著或向著半徑移動的
3. Every family within a radius of25 miles of the city center.
   住在離城中心半徑25英里的范圍內(nèi)的家庭
4. We can compute the circular area with radius.
   我們能用半徑計(jì)算出圓的面積。

ra.di.i

n.（名詞）
A plural of radius
radius的復(fù)數(shù)