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单词 Circle sector
释义

Circle sector

中文百科

扇形 Circular sector

(重定向自Circle sector)
Sector circular de ángulo θ.

扇形指圆上被两条半径和半径所截之一段弧所围成的图形。因形状如一把扇子而得名。

扇形的圆心角∝面积∝弧长。

  • 面积:A = \pi r^2 \cdot \frac{\alpha}{360^\circ}
  • 弧长:b = 2 \pi r \cdot \frac{\alpha}{360^\circ}

α单位为α°(度)


如α单位为弧度「弪」

  • 面积:A = \frac {\alpha r^2} {2}
  • 弧长:b = \alpha r
英语百科

Circular sector 扇形

(重定向自Circle sector)
A circular sector is shaded in green

A circular sector or circle sector (symbol: ), is the portion of a disk enclosed by two radii and an arc, where the smaller area is known as the minor sector and the larger being the major sector. In the diagram, θ is the central angle in radians, r the radius of the circle, and L is the arc length of the minor sector.

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更新时间:2025/6/19 21:42:29