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... age, and asked, pointing to the topic on it. "Professor, I don't know much about the Cartesian coordinate system you mentioned today...especially this question..."
"If you want to judge the distance between two coordinate points, you need to use the Pythagorean theorem mentioned earlier. You can mark the difference between the horizontal and vertical coordinates on the coordinate axis, and then connect them together with a line. So it becomes two right-angled triangles put together, so it ...
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