When two lines form an angle, the amount by which one line (the radius) rotates from the other line (the starting line) that serves as the reference. It is classified as positive or negative depending on the direction of rotation. Source: About Shogakukan Digital Daijisen Information | Legend |
二つの半直線が角をつくるとき、基準となる一方の半直線(始線)から他方の半直線(動径)がどれだけ回転したかの量。回転の向きによって、正・負の別をつける。
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