rectangular cartesian coordinate system
直角二角形：right-angled triangle 直角笛卡儿坐标系：rectangular cartesian coordinate system 直角等腰三角形：right angled isosceles triangle ..
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分析和计算的空间问题，一般可采用两类坐标系：笛卡儿直角坐标系和极坐标系。
There are two kinds of coordinates, Cartesian coordinates and polar coordinates, with which spatial issues are analyzed and calculated.
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