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例题2（P点可拖动）
Author:
杜洋
GeoGebra
New Resources
柱體建築師
近似值：有效數字
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
第八周作业
Discover Resources
讀磅 (練習)
GeoGebra Tube
徐州2015中考-28
Conic section
Circle
Discover Topics
Parallelogram
Line Segment
Polygons
Pythagoras or Pythagorean Theorem
Diagrams