A radian is the Angle subtended by an arc of a circle whose length is just equal to the radius.
一弧度就是长度刚好等于半径的一段圆弧所对的圆心角。
One group of arc-shaped balancing segments with the same length and the same radian is preferred.
一组弧形平衡段同长度、同弧度的平衡段为佳。
One group of arc-shaped balancing segments with the same length and the same radian is preferred.
一组弧形平衡段同长度、同弧度的平衡段为佳。
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