Berlin DE, 2020

When the teacher drew a rectangle shape on the blackboard in an elementary school math class and asked, "Do you know which ones are the vertical and horizontal lines?", all immediately answered that two lines located in horizontal positions vertically are the "vertical lines" and the other two lines located in vertical positions horizontally are the "horizontal lines". It was initially very difficult for me to understand and I almost started hating math because of this experience.
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