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http://www.qsir.org/?p=8853
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GeoGebra
New Resources
畫出對稱圖形
國旗 (Claude 版)
Earth with coastline
兩組對邊相等和有直角的四邊形
Nested spiral octagon
Discover Resources
繪畫三角形的外接圓
畢氏定理動態證明(歐基里得，平形四邊形等面積2，應用時間參數跳躍函數配合向量)
Scientific Notation 科學記數法
空間多面體外接球 切平面
认识方程
Discover Topics
Addition
Algebra
Arithmetic
Isosceles Triangles
Kite