Like artistic images, mathematical images are a special form of mathematics used to reflect reality. But each person imagines in a different way, imagining will lead to different concepts, yet it still follows the rules of thinking. For example, to define a square, one has to rely on a rectangle or a parallelogram, to define a parallelogram, it is necessary to define a quadrilateral, to define a quadrilateral, it is necessary to define a fold line ... Just like that until the end, mathematicians all agreed to recognize some basic concepts such as points, lines, planes ...
A simple question of weight ratios shirt 
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