radian
🇺🇸
/ˈreɪdiən/
🇬🇧
/ˈreɪdiən/
A measure for angles. One radian is the angle made when you take the radius of a circle and wrap it along the edge of the circle.
The engineer explained that the machine's arm rotated 2 radians, which is a bit more than 90 degrees.
エンジニアは、機械のアームが2ラジアン回転し、これは90度よりもわずかに多いことを説明しました。