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物理图象的坐标系中的横、纵坐标轴的刻度不一定对应相等,而且单位(或量纲)一般是不同的,具有各向异性．因此求物理图象中圆的“面积”时应该用椭圆的面积公式．物理图象中的椭圆也可以通过改变坐标轴的刻度大小或倍率而转化为圆．
The scale of the horizontal and vertical axes in the coordinate system of the physical image does not necessarily correspond to the same, and the unit (or dimension) is generally different and has anisotropy. Therefore, the area formula of the ellipse should be used to find the “area” of the circle in the physical image. The ellipse in the physical image can also be transformed into a circle by changing the scale or magnification of the coordinate axis.