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Parallel Lines & Perpendicular Lines 平行線與垂直線
Author:
Alex CHIK
移動紅色點使兩條直線互相平行或互相垂直，然後用三角尺檢查結果。
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גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
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