一弧度就是长度刚好等于半径的一段圆弧所对的圆心角。
A radian is the Angle subtended by an arc of a circle whose length is just equal to the radius.
他先切下一块圆心角60度的扇形，把这块颠倒过来，糖衣放在下面。
He cuts a piece forming a circular sector of 60 degrees and flips the piece upside down, with the icing on the bottom.
根据圆弧的时间分割法插补原理，开发了基于圆心角分割的双曲线、抛物线插补算法。
According to the interpolation principle of time division of an arc, a hyperbolic interpolation algorithm and a parabolic interpolation algorithm based on central Angle division are developed.
利用有限元软件，建立了跨径相同、曲率半径和圆心角以及支撑形式不同的弯梁桥计算模型。
The calculation models of curved beam Bridges with same span length, but different curvature radius, center angles and supporting forms are established by means of finite element software.
令人惊奇的是，对于任意大小的扇形，即使圆心角是一个无理数：经过有限步之后，所有的糖衣都会回到上面。
Amazingly, this works for any piece size, even if the cutting Angle is an irrational number: all the icing will be back on top after a finite number of steps.
令人惊奇的是，对于任意大小的扇形，即使圆心角是一个无理数：经过有限步之后，所有的糖衣都会回到上面。
Amazingly, this works for any piece size, even if the cutting Angle is an irrational number: all the icing will be back on top after a finite number of steps.
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