弧度
弧度（英文：radian）係一隻度量角度嗰單位。一隻圓弧同佢嗰半徑嗰圓心角共樣莽，箇就係隻單位弧度。佢有時間拕記做 rad。
- 2π rad = 360°
- 1 rad = 180/π°（約57.29578°）
- 1° = π/180 rad
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