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5 squares
Author:
johnmayhk
GeoGebra
Purple points are mid-points of corresponding line segments. Drag blue points to change the size and orientation of squares. Are two red line segments perpendicular to each other always?
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【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
柱體建築師
拼砌四邊形
兩位數加法
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Proof35 高士哲
quadratic
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Planes
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