radius

詞型變化：

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英文解釋：

名詞 radius:

1. the length of a line segment between the center and circumference of a circle or sphere
   同義詞：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
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
   同義詞：spoke, wheel spoke

例句：

1. The radius of a circle described by a crank, cam, or similar machine part.
   (曲軸的)半徑曲柄、凸輪或類似機器部件形成的圓的半徑
2. We can compute the circular area with radius.
   我們能用半徑計算出圓的面積。
3. The police searched all the woods within a six-mile radius.
   警察搜尋了在周圍六英里以內的樹林各處。