笛卡兒坐標系統
笛卡兒坐標系統（英文：Cartesian coordinate system），又叫直角坐標系統，係種正交坐標系統，由笛卡兒發明。坐標系統各有一條垂直（通常叫 y 軸）同水平（通常叫 x 軸）嘅數軸，兩條數軸交匯嗰點(0,0)叫原點。
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