X coordinates: The Xcoordinate is a point's horizontal distance from the origin.
X 坐标:X 坐标是某一个点距离原点的水平距离。
2
The Xcoordinate of the first element (10) will be 200, the second element (20) will be 400, and so on.
第一个元素(10)的X坐标将是200,第二个元素(20)的X坐标将是400,依此类推。
3
So, switching the area, moving the area to the other side, I'll get double integral of xdA is the area of origin times the xcoordinate of the center of mass.