● 弪(弳)jìng ㄐㄧㄥˋ
◎ 数学上指“弧度”。当圆周上某段圆弧的弧长等于该圆的半径时,称此圆弧所对的圆心角为一弧度。
circular measure
◎ 弪 弳 jìng 〈名词〉即“弧度”。当圆周上某段圆弧的弧长等于该圆的半径时,称此圆弧所对的圆心角为一弧度
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